Question

我知道，已经有几个类似的问题，但是没有一个能解决我的问题。我有一个简单的JSP

<!DOCTYPE html>
<html>
   <head>
      <meta charset="UTF-8">
      <title>Home Page</title>
   </head>
   <body>    
      <jsp:include page="_menu.jsp"></jsp:include>    
      <h3>Home Page</h3>   
      <table>
            <tr>
               <td>aha</td>
            </tr>
         </table>
         ${data.image}      
         <img src="images/wappen.jpg"/>   
         <img src="/images/wappen.jpg"/>   
         <img src="../images/wappen.jpg" alt=""/>   
   </body>
</html>

没有图像显示。 JSP位于WEB-INF / views中的战争中 jpg位于战争中的文件夹图像中。

目录结构：

-WebContent
 - images (here are my jpgs)
 - META-INF 
 - WEB-INF 
   - lib 
   - views (here are my jsps located)

通过WebServlet调用jsp：

RequestDispatcher dispatcher = this.getServletContext().getRequestDispatcher("/WEB-INF/views/homeView.jsp");
dispatcher.forward(request, response);

Answer 1

我不知道这是否正确，但至少我找到了解决方法：

创建一个Webservlet来处理上下文图像：

获取请求的图片
构建图像的绝对文件名
从磁盘加载图像
返回为响应

import java.io.BufferedInputStream; 导入java.io.BufferedOutputStream; 导入java.io.FileInputStream; 导入java.io.IOException; 导入java.lang.invoke.MethodHandles;

import javax.servlet.ServletException; 导入javax.servlet.ServletOutputStream; 导入javax.servlet.annotation.WebServlet; 导入javax.servlet.http.HttpServlet; 导入javax.servlet.http.HttpServletRequest; 导入javax.servlet.http.HttpServletResponse;

导入org.slf4j.ext.XLogger; 导入org.slf4j.ext.XLoggerFactory;

@WebServlet（urlPatterns = {“ / Images / *”}）公共类DisplayImageServlet扩展了HttpServlet { / **保持记录器* / 最终的XLogger logger = XLoggerFactory.getXLogger（MethodHandles.lookup（）。lookupClass（））;
```
private static final long serialVersionUID = 1L;
```
public DisplayImageServlet（）{ 超（）; }

@Override 受保护的void doGet（HttpServletRequest请求，HttpServletResponse响应）引发ServletException，IOException { HttpServletRequest req =（HttpServletRequest）请求；
```
  String realRootPath = request.getServletContext().getRealPath("");
    String servletPath = req.getServletPath();
    String image = req.getRequestURI();
    String pathInfo = request.getPathInfo();

    logger.debug("realRootPath = " + realRootPath);
    logger.debug("servletPath = " + servletPath);
    logger.debug("image = " + image);
    logger.debug("pathInfo = " + pathInfo);
    String imageRealPath = realRootPath +servletPath+pathInfo;

    logger.debug("imageRealPath = " + imageRealPath);
    response.setContentType("image/jpeg");  
    ServletOutputStream out;  
    out = response.getOutputStream();  
    FileInputStream fin = new FileInputStream(imageRealPath);  

    BufferedInputStream bin = new BufferedInputStream(fin);  
    BufferedOutputStream bout = new BufferedOutputStream(out);  
    int ch =0; ;  
    while((ch=bin.read())!=-1)  
    {  
        bout.write(ch);  
    }  

    bin.close();  
    fin.close();  
    bout.close();  
    out.close();  
```
}

@Override 受保护的void doPost（HttpServletRequest请求，HttpServletResponse响应）引发ServletException，IOException { logger.debug（“ doPost”）; doGet（请求，响应）; }

}

JSP中未显示战争中的图像

1 个答案: