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<time datetime="2019-03-31T08:54:46.000Z" itemprop="datePublished">2019-03-31</time>
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<a class="article-title" href="/2019/03/31/Spring-Boot-JPA/">Spring Boot JPA</a>
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<div class="article-entry" itemprop="articleBody">
<h3 id="一-构建SrpingBoot项目"><a href="#一-构建SrpingBoot项目" class="headerlink" title="一. 构建SrpingBoot项目"></a>一. 构建SrpingBoot项目</h3><h4 id="1-通过IDEA创建Boot项目-File-gt-New-gt-Project"><a href="#1-通过IDEA创建Boot项目-File-gt-New-gt-Project" class="headerlink" title="1. 通过IDEA创建Boot项目(File->New->Project)"></a>1. 通过IDEA创建Boot项目(File->New->Project)</h4><p><img src="/2019/03/31/Spring-Boot-JPA/01.gif" alt="01"></p>
<h4 id="2-选择需要的依赖：web、jpa、mysql"><a href="#2-选择需要的依赖：web、jpa、mysql" class="headerlink" title="2. 选择需要的依赖：web、jpa、mysql"></a>2. 选择需要的依赖：web、jpa、mysql</h4><p><img src="/2019/03/31/Spring-Boot-JPA/02.gif" alt="02"></p>
<blockquote>
<p>默认官网的源速度感人，可替换为阿里的源，使用附件中的setting文件。</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527291694852.png" alt="1527291694852"></p>
</blockquote>
<h4 id="3-未使用IDEA或MyEclipse-等IDE的同学，可以通过官方网站创建项目"><a href="#3-未使用IDEA或MyEclipse-等IDE的同学，可以通过官方网站创建项目" class="headerlink" title="3. 未使用IDEA或MyEclipse 等IDE的同学，可以通过官方网站创建项目"></a>3. 未使用IDEA或MyEclipse 等IDE的同学，可以通过官方网站创建项目</h4><ul>
<li><p>打开URL： start.spring.io，同样输入项目相关信息及所需的依赖</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/03.gif" alt="03"></p>
</li>
<li><p>下载解压后通过Maven方式导入（由于项目为Maven项目，所以必须已经安装Maven环境）</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/04.gif" alt="04"></p>
</li>
</ul>
<h4 id="4-进行项目相关配置"><a href="#4-进行项目相关配置" class="headerlink" title="4. 进行项目相关配置"></a>4. 进行项目相关配置</h4><ul>
<li><p>修改配置文件类型为yml（可选）</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/05.gif" alt="05"></p>
</li>
<li><p>配置项目相关信息：数据库连接信息、JPA SQL语句输出、日志打印级别；也可以在这设置项目端口、路径等</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/06.gif" alt="06"></p>
</li>
</ul>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">spring:</span></span><br><span class="line"><span class="attr"> datasource:</span></span><br><span class="line"><span class="attr"> driver-class-name:</span> <span class="string">com.mysql.jdbc.Driver</span></span><br><span class="line"><span class="attr"> username:</span> <span class="string">root</span></span><br><span class="line"><span class="attr"> password:</span> <span class="string">root</span></span><br><span class="line"><span class="attr"> url:</span> <span class="attr">jdbc:mysql://localhost:3306/book?useSSL=false</span></span><br><span class="line"><span class="attr"> jpa:</span></span><br><span class="line"><span class="attr"> show-sql:</span> <span class="literal">true</span></span><br><span class="line"><span class="attr">logging:</span></span><br><span class="line"><span class="attr"> level:</span></span><br><span class="line"> <span class="string">cn.edu.ncu.bootjpademo:</span> <span class="string">debug</span></span><br></pre></td></tr></table></figure>
<p>jpa.show-sql: true 运行时输出SQL，方便进行调试。</p>
<p>logging.level 可以指定不同包的日志输出级别。</p>
<h3 id="二-编码实现"><a href="#二-编码实现" class="headerlink" title="二. 编码实现"></a>二. 编码实现</h3><h4 id="1-创建相应的package：entity、dao、service、controller"><a href="#1-创建相应的package：entity、dao、service、controller" class="headerlink" title="1. 创建相应的package：entity、dao、service、controller"></a>1. 创建相应的package：entity、dao、service、controller</h4><p><img src="/2019/03/31/Spring-Boot-JPA/1527289497629.png" alt="1527289497629"></p>
<h4 id="2-书籍分类查询功能"><a href="#2-书籍分类查询功能" class="headerlink" title="2. 书籍分类查询功能"></a>2. 书籍分类查询功能</h4><ul>
<li><p>按照表结构创建分类entity，并通过idea自动生成getter、setter及toString方法</p>
<ul>
<li>类标记注解为@Entity，并在主键（@Id）和自增字段（@GeneratedValue）上添加相应的注解</li>
</ul>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527298927655.png" alt="1527298927655"></p>
</li>
<li><p>创建dao接口，接口类 extends JpaRepository<T,ID>，T和ID分别为相应的实体和主键类型</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527292519397.png" alt="1527292519397"></p>
</li>
<li><p>创建相应的service</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BookCategoryService</span> </span>{</span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="keyword">private</span> BookCategoryDao bookCategoryDao;</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> <span class="doctag">@description</span> 查询所有分类信息</span></span><br><span class="line"><span class="comment"> <span class="doctag">@param</span></span></span><br><span class="line"><span class="comment"> <span class="doctag">@return</span> List<BookCategory></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> List<BookCategory> <span class="title">findAll</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">return</span> bookCategoryDao.findAll();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
<ul>
<li>创建service的单元测试方法<br><img src="/2019/03/31/Spring-Boot-JPA/test.gif" alt="test"></li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RunWith</span>(SpringRunner.class)</span><br><span class="line"><span class="meta">@SpringBootTest</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BookCategoryServiceTest</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">final</span> Logger logger =</span><br><span class="line"> LoggerFactory.getLogger(<span class="keyword">this</span>.getClass());</span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="keyword">private</span> BookCategoryService service;</span><br><span class="line"> <span class="meta">@Test</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">findAll</span><span class="params">()</span> </span>{</span><br><span class="line"> logger.debug(service.findAll().toString());</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li><p>运行测试方法，观察日志输入是否正常（可先在数据库表中添加测试数据）</p>
</li>
<li><p>创建controller类（<strong>BookCategoryController</strong>）及方法（<strong>findAl</strong>l）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="meta">@RequestMapping</span>(value = <span class="string">"category"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BookCategoryController</span> </span>{</span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="keyword">private</span> BookCategoryService service;</span><br><span class="line"> <span class="comment">/**</span></span><br><span class="line"><span class="comment"> <span class="doctag">@Description</span> 获取全部分类信息</span></span><br><span class="line"><span class="comment"> <span class="doctag">@Param</span></span></span><br><span class="line"><span class="comment"> <span class="doctag">@Return</span> List<BookCategory></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> <span class="meta">@RequestMapping</span>(value = <span class="string">""</span>,method = RequestMethod.GET)</span><br><span class="line"> <span class="function"><span class="keyword">public</span> List<BookCategory> <span class="title">findAll</span><span class="params">()</span></span>{</span><br><span class="line"> <span class="keyword">return</span> service.findAll();</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
<ul>
<li><p>运行整个项目，并使用postman访问（get方法也可以通过浏览器访问）</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/run.gif" alt="run"></p>
<p>Postman获取方式：(<a href="https://www.getpostman.com/" target="_blank" rel="noopener">https://www.getpostman.com/</a> 或者 添加chrome插件方式获取)</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527295750988.png" alt="1527295750988"></p>
</li>
</ul>
<h4 id="3-insert功能"><a href="#3-insert功能" class="headerlink" title="3.insert功能"></a>3.insert功能</h4><ul>
<li>简单的CRUD功能JPA已经提供，不需要手工完成dao的实现类</li>
</ul>
<ul>
<li><p>dao不用修改，直接在service（<strong>BookServiceService</strong>）中添加插入功能（<strong>saveBookCategory</strong>）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"><span class="doctag">@description</span> 添加书籍分类信息</span></span><br><span class="line"><span class="comment"><span class="doctag">@param</span> bookCategory</span></span><br><span class="line"><span class="comment"><span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">saveBookCategory</span><span class="params">(BookCategory bookCategory)</span> </span>{</span><br><span class="line"> bookCategoryDao.save(bookCategory);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
<li><p>创建测试方法</p>
<ul>
<li>因为JPA是懒加载，所以需要在测试类上加上注解@Transactional</li>
</ul>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527299391349.png" alt="1527299391349"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">save</span><span class="params">()</span> </span>{</span><br><span class="line"> BookCategory bookCategory = <span class="keyword">new</span> BookCategory();</span><br><span class="line"> Timestamp t = <span class="keyword">new</span> Timestamp(System.currentTimeMillis());</span><br><span class="line"> bookCategory.setCategoryName(<span class="string">"科技"</span>);</span><br><span class="line"> bookCategory.setCreateTime(t);</span><br><span class="line"> bookCategory.setUpdateTime(t);</span><br><span class="line"> service.saveBookCategory(bookCategory);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
</ul>
<ul>
<li><p>执行测试，查看结果（由于添加@Transactional 之后在测试类中并不会commit，所以数据库中不会有新增记录）</p>
</li>
<li><p>添加contorller方法</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"><span class="doctag">@description</span> 通过POST获取数据，并添加分类信息</span></span><br><span class="line"><span class="comment"><span class="doctag">@param</span> bookCategory</span></span><br><span class="line"><span class="comment"><span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="meta">@PostMapping</span>(<span class="string">""</span>)</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">saveBookCategory</span><span class="params">(BookCategory bookCategory)</span></span>{</span><br><span class="line"> service.saveBookCategory(bookCategory);</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>使用@PostMapping 等于 @RequestMapping(value,method = RequestMethod.POST)</p>
</li>
<li><p>启动项目，并使用Postman进行测试</p>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527306639192.png" alt="1527306639192"></p>
<blockquote>
<p>时间格式为：yyyy-mm-dd hh:mm:ss</p>
</blockquote>
<p>查看数据库中数据，并观察控制台的输出。</p>
<p><strong>思考题：JPA如何将post中的数据存入数据库的？</strong></p>
<p><strong>自己动手完成删除、更新功能</strong></p>
</li>
</ul>
<h3 id="三-手动映射及SQL"><a href="#三-手动映射及SQL" class="headerlink" title="三. 手动映射及SQL"></a>三. 手动映射及SQL</h3><h4 id="1-表和字段"><a href="#1-表和字段" class="headerlink" title="1. 表和字段"></a>1. 表和字段</h4><ul>
<li><p>建立一个非驼峰风格表</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">CREATE</span> <span class="keyword">TABLE</span> <span class="string">`book`</span> (</span><br><span class="line"> <span class="string">`id`</span> <span class="built_in">varchar</span>(<span class="number">40</span>) <span class="keyword">NOT</span> <span class="literal">NULL</span>,</span><br><span class="line"> <span class="string">`name`</span> <span class="built_in">varchar</span>(<span class="number">100</span>) <span class="keyword">NOT</span> <span class="literal">NULL</span>,</span><br><span class="line"> <span class="string">`author`</span> <span class="built_in">varchar</span>(<span class="number">100</span>) <span class="keyword">NOT</span> <span class="literal">NULL</span>,</span><br><span class="line"> PRIMARY <span class="keyword">KEY</span> (<span class="string">`id`</span>))</span><br></pre></td></tr></table></figure>
</li>
<li><p>建立entity（记得生成getter、setter方法）</p>
</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Entity</span></span><br><span class="line"><span class="meta">@Table</span>(name = <span class="string">"book"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Book</span> </span>{</span><br><span class="line"> <span class="meta">@Id</span></span><br><span class="line"> <span class="meta">@Column</span>(name = <span class="string">"id"</span>)</span><br><span class="line"> <span class="keyword">private</span> String id;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Column</span>(name = <span class="string">"name"</span>)</span><br><span class="line"> <span class="keyword">private</span> String name;</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Column</span>(name = <span class="string">"author"</span>)</span><br><span class="line"> <span class="keyword">private</span> String author;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>创建dao</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">BookDao</span> <span class="keyword">extends</span> <span class="title">JpaRepository</span><<span class="title">Book</span>,<span class="title">String</span>></span>{</span><br><span class="line"> <span class="meta">@Query</span>(value = <span class="string">"select * from book where id < ?"</span>,nativeQuery = <span class="keyword">true</span>)</span><br><span class="line"> <span class="function">List<Book> <span class="title">queryBook</span><span class="params">(String id)</span></span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>创建service</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Service</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">BookService</span> </span>{</span><br><span class="line"> <span class="meta">@Autowired</span></span><br><span class="line"> <span class="keyword">private</span> BookDao dao;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> List<Book> <span class="title">queryBook</span><span class="params">(String id)</span></span>{</span><br><span class="line"> <span class="keyword">return</span> dao.queryBook(id);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ul>
<li>进行单元测试，观察输出结果是否正确。</li>
</ul>
<p><strong>自己创建controller类及相应方法，并使用Postman或浏览器访问路径，并打印结果</strong></p>
<h3 id="四-文件上传"><a href="#四-文件上传" class="headerlink" title="四. 文件上传"></a>四. 文件上传</h3><h4 id="1-建立上传文件夹"><a href="#1-建立上传文件夹" class="headerlink" title="1. 建立上传文件夹"></a>1. 建立上传文件夹</h4><p><img src="/2019/03/31/Spring-Boot-JPA/1527312215520.png" alt="1527312215520"></p>
<p>建立 upload/images 文件夹</p>
<h4 id="2-在controller-package下创建-UploadFileController类"><a href="#2-在controller-package下创建-UploadFileController类" class="headerlink" title="2. 在controller package下创建 UploadFileController类"></a>2. 在controller package下创建 UploadFileController类</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@RestController</span></span><br><span class="line"><span class="meta">@RequestMapping</span>(<span class="string">"/file"</span>)</span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UploadFileController</span> </span>{</span><br><span class="line"> </span><br><span class="line"> <span class="meta">@PostMapping</span>(<span class="string">"/images"</span>)</span><br><span class="line"> <span class="function"><span class="keyword">public</span> String <span class="title">singleFileUpload</span><span class="params">(@RequestParam(<span class="string">"file"</span>)</span> MultipartFile file) </span>{</span><br><span class="line"> <span class="keyword">if</span> (file.isEmpty()) {</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"请选择上传文件"</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">try</span> { </span><br><span class="line"> <span class="keyword">byte</span>[] bytes = file.getBytes();</span><br><span class="line"> Path path = Paths.get(<span class="string">"upload/images/"</span>+file.getOriginalFilename());</span><br><span class="line"> Files.write(path, bytes);</span><br><span class="line"> } <span class="keyword">catch</span> (IOException e) {</span><br><span class="line"> e.printStackTrace();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> <span class="string">"上传成功"</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h4 id="3-启动项目，使用Postman进行测试"><a href="#3-启动项目，使用Postman进行测试" class="headerlink" title="3. 启动项目，使用Postman进行测试"></a>3. 启动项目，使用Postman进行测试</h4><p><img src="/2019/03/31/Spring-Boot-JPA/1527312710438.png" alt="1527312710438"></p>
<p>URL：<a href="http://localhost:8080/file/images" target="_blank" rel="noopener">http://localhost:8080/file/images</a> </p>
<h4 id="4-也可以启动Nginx或Apache等Web服务器，编写html页面进行测试（也可以直接打开）"><a href="#4-也可以启动Nginx或Apache等Web服务器，编写html页面进行测试（也可以直接打开）" class="headerlink" title="4. 也可以启动Nginx或Apache等Web服务器，编写html页面进行测试（也可以直接打开）"></a>4. 也可以启动Nginx或Apache等Web服务器，编写html页面进行测试（也可以直接打开）</h4><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><!DOCTYPE html></span></span><br><span class="line"><span class="tag"><<span class="name">html</span>></span></span><br><span class="line"><span class="tag"><<span class="name">head</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">"UTF-8"</span>></span></span><br><span class="line"><span class="tag"></<span class="name">head</span>></span></span><br><span class="line"><span class="tag"><<span class="name">body</span>></span></span><br><span class="line"><span class="tag"><<span class="name">h1</span>></span>Spring Boot file upload example<span class="tag"></<span class="name">h1</span>></span></span><br><span class="line"><span class="tag"><<span class="name">form</span> <span class="attr">method</span>=<span class="string">"POST"</span> <span class="attr">action</span>=<span class="string">"http://localhost:8080/file/images"</span> <span class="attr">enctype</span>=<span class="string">"multipart/form-data"</span> <span class="attr">accept-charset</span>=<span class="string">"UTF-8"</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">input</span> <span class="attr">type</span>=<span class="string">"file"</span> <span class="attr">name</span>=<span class="string">"file"</span> /></span><span class="tag"><<span class="name">br</span>/></span><span class="tag"><<span class="name">br</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"Submit"</span> /></span></span><br><span class="line"><span class="tag"></<span class="name">form</span>></span></span><br><span class="line"><span class="tag"></<span class="name">body</span>></span></span><br><span class="line"><span class="tag"></<span class="name">html</span>></span></span><br></pre></td></tr></table></figure>
<p><img src="/2019/03/31/Spring-Boot-JPA/upload.gif" alt="upload"></p>
<p><img src="/2019/03/31/Spring-Boot-JPA/1527313136713.png" alt="1527313136713"></p>
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<article id="post-hello-world" class="article article-type-post" itemscope itemprop="blogPost">
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<a class="article-title" href="/2019/03/31/hello-world/">Hello World</a>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
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<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
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