最近有點小忙，但是還是在晚上抽出來點時間更新文章，希望對初學者有幫助(都是從那時候過來的，哈哈)一起努力。

開始正題~~~~

封裝類ResultVo

在與前臺頁面交互的過程中我們一般會用到一個封裝類，來傳遞數據，我在這里寫了一個，見圖(通過本文你就會知道它的用處了)。

package com.songci.mytest_one.model.utils;

/**

* Created by songl on 2017/8/10.

*/

public class ResultVo {

private boolean success = false;

private String message = null;

private T result = null;

public void isSuccess(boolean b) {

this.success=b;

}

public void setMessage(String message) {

this.message = message;

}

public void setResult(T result) {

this.result = result;

}

public boolean getSuccess(){

return success;

}

public String getMessage() {

return message;

}

public T getResult() {

return result;

}

}

修改StudentService接口(返回結果用上ResultVo)

StudentService

package com.songci.mytest_one.service;

import com.songci.mytest_one.model.Student;

import com.songci.mytest_one.model.utils.ResultVo;

import java.util.List;

/**

* Created by songl on 2017/8/8.

*/

public interface StudentService {

/**

* 添加學生

* @param student

* @return

*/

Boolean addStudent(Student student);

/**

* 根據ID刪除學生

* @param id

* @return

*/

Boolean deleteStudentById(Integer id);

/**

* 根據ID修改學生信息

* @param student

* @return

*/

Boolean updateStudentById(Student student);

/**

* 按條件查找所有學生

* @param student

* @return

*/

//修改之處

ResultVo findAllStudent(Student student);

}

StudentServiceImpl

package com.songci.mytest_one.service.impl;

import com.songci.mytest_one.dao.StudentDao;

import com.songci.mytest_one.model.Student;

import com.songci.mytest_one.model.utils.ResultVo;

import com.songci.mytest_one.service.StudentService;

import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;

/**

* Created by songl on 2017/8/8.

*/

@Service("StudentService")

public class StudentServiceImpl implements StudentService{

@Resource

private StudentDao studentDao;

public Boolean addStudent(Student student) {

return studentDao.insert(student);

}

public Boolean deleteStudentById(Integer id) {

Student student=new Student();

student.setId(id);

return studentDao.delete(student);

}

public Boolean updateStudentById(Student student) {

return studentDao.update(student);

}

//修改之處start

public ResultVo findAllStudent(Student student) {

ResultVo resultVo=new ResultVo();

List list= studentDao.select(student);

if (list.size()>0){

resultVo.setResult(list);

resultVo.isSuccess(true);

}else {resultVo.setMessage("沒有找到相關信息");}

return resultVo;

}

//修改之處end

}

完成StudentController

package com.songci.mytest_one.controller;

import com.songci.mytest_one.model.Student;

import com.songci.mytest_one.model.utils.ResultVo;

import com.songci.mytest_one.service.StudentService;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;

/**

* Created by songl on 2017/8/10.

*/

@Controller

@RequestMapping("/studentApi/")

public class StudentController {

@Resource

private StudentService studentService;

@RequestMapping("findAllStudentInfo")

public @ResponseBody //添加@ResponseBody直接返回json數據

ResultVo findAllStudentInfo (@RequestParam("id") String id){

Student student=new Student();

//在此我就不做過多驗證判斷

if ("0".equals(id)){student=null;}

else {student.setId(new Integer(id));}

return studentService.findAllStudent(student);

}

}

web.xml引用配置文件

/p>

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"

"http://java.sun.com/dtd/web-app_2_3.dtd" >

contextConfigLocation

classpath:config/applicationContext.xml

log4jConfigLocation

classpath:config/log4j.properties

log4jRefreshInterval

6000

SpringEncodingFilter

org.springframework.web.filter.CharacterEncodingFilter

encoding

UTF-8

forceEncoding

true

SpringEncodingFilter

/*

org.springframework.web.util.Log4jConfigListener

org.springframework.web.context.ContextLoaderListener

spring

org.springframework.web.servlet.DispatcherServlet

contextConfigLocation

classpath:config/spring-mvc.xml

2

spring

*.do

直接就在歡迎頁index.jsp添加代碼(悄悄告訴你，里面用到了Ajax與jquery，滿滿知識點)

jquery.js已上傳GitHub

開發中......

Hello World!

用異步請求獲取學生信息

請輸入學生學號，如果是0則查詢所有學生信息

點我查詢

function findStudentInfo() {

var studentid=$("#studentid").val();

// alert("獲取到的studentid：" + studentid);

$.ajax({

type:"POST",

url:"/studentApi/findAllStudentInfo.do",

data:{id:studentid},

dataType:"json",

success : function (data) {

if(data.success){

$("#showMessageDiv").empty();

$("#showMessageDiv").append("

");

$("#table1").append("

學生ID姓名性別地址");

$.each(data.result,function (i,result) {

var sex="女"

if (result.sex){sex="男"}

var item="

"+result.id+""+result.name+""+sex+""+result.address+"";

$("#table1").append(item);

});

}else {

$("#showMessageDiv").empty();

$("#showMessageDiv").append(data.message);

}

}

});

}

測試結果

有什么問題可以在下方留言，我們一起討論，一起進步。

將持續更新 ~~~

未完待續~~~

如果感覺文章不錯記得點贊哦，謝謝支持。

《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

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