ssm后端校验，解决数据无法回显和jsp页面属性无法绑定userBean

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login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %><jsp:useBean id="user" class="com.sjxy.ssm.entity.User"></jsp:useBean>   <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body><center><a href="${pageContext.request.contextPath}/emp/list">显示所有员工信息</a><form:form modelAttribute="user" action="${pageContext.request.contextPath}/user/upload" enctype="multipart/form-data" method="post">  <table>    <tr>    <td>Email address</td>     <td><input name="email"/></td>    <td><form:errors path="email" cssStyle="color:red"/></td>    </tr>    <tr>    <td>Password</td>    <td><input type="password" name="password"/></td>    <td><form:errors path="password" cssStyle="color:red"/></td>    <tr>    <td>File input <input type="file" name="image" ></td>    <td><input type="checkbox">     Check me out</td>    <td><button type="submit">提交</button></td>    </tr>  </table></form:form></center></body></html>

首先导入useBean

<jsp:useBean id="user" class="com.sjxy.ssm.entity.User"></jsp:useBean>

数据绑定，modelAttribute=”user”最好要写

<form:form modelAttribute="user" action="${pageContext.request.contextPath}/user/upload" enctype="multipart/form-data" method="post">

数据回显，input最好不要用 `<form:input>` 老是报错，不清楚具体原因。

<td>Email address</td><td><input name="email"/></td><td><form:errors path="email" cssStyle="color:red"/></td>

Controller做的上传下载register.java

package com.sjxy.ssm.web.hander;import java.io.File;import java.io.IOException;import java.io.UnsupportedEncodingException;import javax.servlet.http.HttpServletRequest;import javax.validation.Valid;import org.apache.commons.io.FileUtils;import org.springframework.http.HttpHeaders;import org.springframework.http.HttpStatus;import org.springframework.http.MediaType;import org.springframework.http.ResponseEntity;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.validation.Errors;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import com.sjxy.ssm.entity.User;@Controller@RequestMapping(value="/user")public class register {    @RequestMapping(value="/upload")    public String upload(@Valid @ModelAttribute("user") User user,Errors errors,            Model model,HttpServletRequest request) throws Exception  {        System.out.println(user.getEmail());        //logger.info(user);        if(errors.hasErrors()){            return "user/login";        }        if(!user.getImage().isEmpty()){            String path="E:/upload";            System.out.println(path);            String filename=user.getImage().getOriginalFilename();            File filepath=new File(path,filename);            if(!filepath.getParentFile().exists()){                filepath.getParentFile().mkdirs();            }            user.getImage().transferTo(new File(path+File.separator+filename));            model.addAttribute("user", user);            return "user/success";        }        return "user/error";    }    @RequestMapping(value="/download")    public ResponseEntity<byte[]> download(HttpServletRequest request,            @RequestParam("filename") String filename,Model medel) throws Exception{        String path="E:/upload";        System.out.println(filename);        File file=new File(path+File.separator+filename);        HttpHeaders headers=new HttpHeaders();        String downloadFileName=new String(filename.getBytes("UTF-8"),"iso-8859-1");        headers.setContentDispositionFormData("attachment", downloadFileName);        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers,HttpStatus.CREATED);    }}

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ssm后端校验，解决数据无法回显和jsp页面属性无法绑定userBean

login.jsp

首先导入useBean

数据绑定，modelAttribute=”user”最好要写

数据回显，input最好不要用 <form:input> 老是报错，不清楚具体原因。

Controller做的上传下载register.java

数据回显，input最好不要用 `<form:input>` 老是报错，不清楚具体原因。