Jsp<img>标签加载中文图片失败

古城微笑少年丶 2022-04-06 04:44 338阅读 0赞

Jsp中<img>标签加载中文名字的图片失败解决办法，将img标签的src路径给一个Servlet负责显示图片即可

例子：

在WebRoot目录下有一个存放用户头像的目录userPhotos，其中一用户的头像图片命名"美女.jpg"发现路径没问题，但图片在页面上无法加载，将src的路径指向一Servlet的路径即可：

<img src="imageServlet?flag=showImage&path=userPhotos/美女.jpg }" width="150px">

package com.test.action;
    
    import java.io.File;
    import java.io.IOException;
    import java.io.InputStream;
    import java.lang.reflect.Method;
    import java.util.List;
    import java.util.Set;
    
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import javax.servlet.ServletOutputStream;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.apache.commons.fileupload.FileItem;
    import org.apache.log4j.Logger;
    
    import com.test.pojo.User;
    import com.test.service.UserService;
    import com.test.service.UserServiceImpl;
    import com.test.util.UUIDUtil;
    import com.test.util.UploadUtil;
    
    /**
     * 采用maven构建项目，并使用servlet3.0新特性采用注解的形式
     * @author QuLei
     *
     */
    @WebServlet(name="ImageWeb",urlPatterns="/imageServlet")
    public class ImageServlet extends HttpServlet {
    	private Logger logger = Logger.getLogger(this.getClass());
    
    /**
    		 * The doGet method of the servlet. <br>
    		 *
    		 * This method is called when a form has its tag value method equals to get.
    		 * 
    		 * @param request the request send by the client to the server
    		 * @param response the response send by the server to the client
    		 * @throws ServletException if an error occurred
    		 * @throws IOException if an error occurred
    		 */
    	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		doPost(request, response);
    	}
    
    	/**
    		 * The doPost method of the servlet. <br>
    		 *
    		 * This method is called when a form has its tag value method equals to post.
    		 * 
    		 * @param request the request send by the client to the server
    		 * @param response the response send by the server to the client
    		 * @throws ServletException if an error occurred
    		 * @throws IOException if an error occurred
    		 */
    	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		//response.setContentType("text/html;charset=utf-8");
    		request.setCharacterEncoding("utf-8");
    		Class<? extends ImageServlet> clazz = this.getClass();
    		String flag = request.getParameter("flag");
    		try {
    			Method method = clazz.getMethod(flag, HttpServletRequest.class,HttpServletResponse.class);
    			method.invoke(this, request,response);
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		} 
    	}
    
    /**
    	 * 查看图片
    	 * @param request
    	 * @param response
    	 * @throws ServletException
    	 * @throws IOException
    	 */
    	public void showImage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		ServletOutputStream out = response.getOutputStream();
    		int len = 0;
    		InputStream in = this.getServletContext().getResourceAsStream(request.getParameter("path"));
    		byte b [] = new byte[1024];
    		while(-1!=(len = in.read(b))){
    			out.write(b,0,len);
    		}
    		out.flush();
    		out.close();
    		in.close();
    	}
    }