spring MVC jsp页面获取参数 以对象的方式

Question

jsp里面的body部分

  <h1>用户信息添加2</h1>
  <form action="user/add3.do"  method="post">
        编号:<input type="text"  name="userId"/><br/>
        姓名:<input type="text"  name="userName"/><br/>
        性别:<input type="text"  name="userSex"/><br/>
        <input type="submit"  value="提交"/>
  </form>

Controller部分

@RequestMapping("/user")
public class UserController {

 @RequestMapping("/add3.do" )
 public String add3(UserInfo user)
 {
      System.out.println(user);
      return "user_add3";
 }

}

UserInfo 类

 import java.util.Arrays;

public class UserInfo {
    private Integer userId;
    private String  userName;
    private String  userSex;
    private String[] userXq;
    public Integer getUserId() {
        return userId;
    }
    public void setUserId(Integer userId) {
        this.userId = userId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getUserSex() {
        return userSex;
    }
    public void setUserSex(String userSex) {
        this.userSex = userSex;
    }
    public String[] getUserXq() {
        return userXq;
    }
    public void setUserXq(String[] userXq) {
        this.userXq = userXq;
    }
    @Override
    public String toString() {
        return "UserInfo [userId=" + userId + ", userName=" + userName
                + ", userSex=" + userSex + ", userXq="
                + Arrays.toString(userXq) + "]";
    }

}

已经有utf-8 编码转换

 package com.liu.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * Servlet Filter implementation class UTFFilter
 */
@WebFilter("/*")
public class UTFFilter implements Filter {

    /**
     * Default constructor. 
     */
    public UTFFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }

    /**
     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // TODO Auto-generated method stub
        // place your code here
        request.setCharacterEncoding("utf-8");
        // pass the request along the filter chain
        chain.doFilter(request, response);
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
        // TODO Auto-generated method stub
    }

}

出来的界面 是3个 输入框 如果 我只在第一个输入框里输入了汉字 就报错

The request sent by the client was syntactically incorrect.

---

只在第一个输入框里输入的只是数字的话就不报错
其他情况都不报错
求原因

Answer 1

你第一个输入框是编号，你输入中文最后肯定会报错，因为中文属于字符串类型，而你的编号是整型的。