使用弹簧和mybatis的CRUD

Question

在浏览器中创建CRUD操作时遇到问题

`HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: org.apache.jasper.JasperException: org.springframework.beans.NotReadablePropertyException: Invalid property 'standard' of bean class [com.raistudies.domain.User]: Bean property 'standard' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter?
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:548)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:456)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

在这里我拥有spring mvc + mybatis操作文件的所有部分 //控制器

package com.raistudies.controllers;

import java.util.List;
import java.util.UUID;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.raistudies.domain.User;
import com.raistudies.persistence.UserService;
import com.raistudies.validator.RegistrationValidator;

@Controller
@RequestMapping(value="/registration")
public class RegistrationController {

private RegistrationValidator validator = null;
private UserService userService = null;

@Autowired
public void setUserService(UserService userService) {
    this.userService = userService;
}

public RegistrationValidator getValidator() {
    return validator;
}

@Autowired
public void setValidator(RegistrationValidator validator) {
    this.validator = validator;
}

@RequestMapping(method=RequestMethod.GET)
public String showForm(ModelMap model){
    List<User> users = userService.getAllUser();
    model.addAttribute("users", users);
    User user = new User();
    user.setId(UUID.randomUUID().toString());
    model.addAttribute("user", user);
    return "registration";
}

@RequestMapping(value="/add", method=RequestMethod.POST)
public ModelAndView add(@ModelAttribute(value="user") User user,BindingResult result){
    validator.validate(user, result);
    ModelAndView mv = new ModelAndView("registration");
    if(!result.hasErrors()){
        userService.saveUser(user);
        user = new User();
        user.setId(UUID.randomUUID().toString());
        mv.addObject("user", user);
    }
    mv.addObject("users", userService.getAllUser());
    return mv;
}

@RequestMapping(value="/update", method=RequestMethod.POST)
public ModelAndView update(@ModelAttribute(value="user") User user,BindingResult result){
    validator.validate(user, result);
    ModelAndView mv = new ModelAndView("registration");
    if(!result.hasErrors()){
        userService.updateUser(user);
        user = new User();
        user.setId(UUID.randomUUID().toString());
        mv.addObject("user", user);
    }
    mv.addObject("users", userService.getAllUser());
    return mv;
}

@RequestMapping(value="/delete", method=RequestMethod.POST)
public ModelAndView delete(@ModelAttribute(value="user") User user,BindingResult result){
    validator.validate(user, result);
    ModelAndView mv = new ModelAndView("registration");
    if(!result.hasErrors()){
        userService.deleteUser(user.getId());
        user = new User();
        user.setId(UUID.randomUUID().toString());
        mv.addObject("user", user);
    }
    mv.addObject("users", userService.getAllUser());
    return mv;
}
 }

持久性

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.raistudies.persistence.UserService">

<resultMap id="result" type="user">
    <result property="id" column="id"/>
    <result property="name" column="name"/>
    <result property="studentClass" column="class"/>
    <result property="roll" column="roll"/>
   <!--  <result property="sex" column="sex"/>-->
</resultMap>

<select id="getAllUser" resultMap="result">  
    SELECT id,name,class,roll
    FROM user; 
</select>

<insert id="saveUser" parameterType="user">
    INSERT INTO user (id,name,standard,age,sex) 
    VALUE (#{id},#{name},#{standard},#{age})
</insert>

<update id="updateUser" parameterType="user"> 
    UPDATE user
    SET
        name = #{name},  
        standard = #{standard},  
        age = #{age},  
        sex = #{sex} 
    where id = #{id} 
</update>

  <delete id="deleteUser" parameterType="int">
    DELETE FROM user
    WHERE id = #{id}
  </delete>
  </mapper>

我必须创建删除更新添加操作但是在运行我的项目时会像上面那样出错......请帮帮我

Answer 1

根据java bean类（包含geter或setter方法的类）的变量更改jsp代码后，它将解决问题。

*特别是我的意思是你必须根据bean变量更改jsp <tr><td>Class : </td><td><form:input path="standard" /></td></tr> *中的路径

上一个jsp文件（错误时间）

  <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<%@ page session="true" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Hello World with Spring 3 MVC</title>
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1251">
    <script type="text/javascript" src='<c:url value="/resources/common.js"/>'></script>
    <script type="text/javascript" src='<c:url value="/resources/registration.js"/>'></script>
    <script type="text/javascript">
        var projectUrl = '<c:url value="/"/>';
        if(projectUrl.indexOf(";", 0) != -1){
            projectUrl = projectUrl.substring(0, projectUrl.indexOf(";", 0));
        }
    </script>       
</head>
<body>
    <fieldset>
    <legend>Registration Form</legend>
    <center>
    <form:form commandName="user" action="/SpringMVCMyBatisCRUDExample/app/registration/add" name="userForm">

    <form:hidden path="id"/>
    <table>
        <tr><td colspan="2" align="left"><form:errors path="*" cssStyle="color : red;"/></td></tr>
        <tr><td>Name : </td><td><form:input path="name" /></td></tr>
        <tr><td>Class : </td><td><form:input path="standard" /></td></tr>
        <tr><td>RollNo: </td><td><form:input path="roll" /></td></tr>

        <tr><td colspan="2"><input type="submit" value="Save Changes"/>
        &nbsp;<input type="reset" name="newUser" value="New User" onclick="setAddForm();" disabled="disabled"/>
        &nbsp;<input type="submit" name="deleteUser" value="Delete User" onclick="setDeleteForm();" disabled="disabled"/></td></tr>
    </table>
    </form:form>
    </center>
    </fieldset>
    <c:if test="${!empty users}">

        <br />
        <center>
            <table width="90%">
                <tr style="background-color: gray;">
                    <th>Name</th>
                    <th>Class</th>
                    <th>RollNo</th>

                </tr>
                <c:forEach items="${users}" var="user">
                    <tr style="background-color: silver;" id="${user.id}" onclick="setUpdateForm('${user.id}');">
                        <td><c:out value="${user.name}"/></td>
                        <td><c:out value="${user.studentClass}"/></td>
                        <td><c:out value="${user.roll}"/></td>

                    </tr>
                </c:forEach>
            </table>
            </center>
        <br />

    </c:if>
</body>

我的java bean类

package com.raistudies.domain;

import java.io.Serializable;


public class User implements Serializable{

private static final long serialVersionUID = 3647233284813657927L;

private String id;
private String name = null;
private String studentClass = null;
private String roll;    

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getStudentClass() {
    return studentClass;
}

public void setStudentClass(String studentClass) {
    this.studentClass = studentClass;
}

public String getRoll() {
    return roll;
}

public void setRoll(String roll) {
    this.roll = roll;
}



@Override
public String toString() {
    return "User [name=" + name + ", class="+ studentClass+ ", roll=" + roll + "]";
}
}

之前我在java bean类（模型类）中有 标准 变量，但我必须将其更改为 studentClass 所以不要错误我们必须改变

的jsp路径

<tr><td>Class : </td><td><form:input path="standard" /></td></tr> .......

到

<tr><td>Class : </td><td><form:input path="studentClass" /></td></tr>