4种方法让SpringMVC接收多个对象

package test.SpringMVC;
//D:\Indigo_workspace2\HelloSpringMVC\src\test\SpringMVC\User.java
import java.util.Date;

public class User {
    
    private String name;
    private int age;
    private Date birthday;

    public User(){
        System.out.println("User()");
    }
    
    public User(String name,int age){
        this.name= name;
        this.age= age;
    }
    
    public User(String name,int age, Date birthday){
        this.name= name;
        this.age= age;
        this.birthday=birthday;
    }
    
    
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        System.out.println("setName(name) ");
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
        System.out.println("setAge(age)");
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }


    
    
}

package test.SpringMVC;
//D:\Indigo_workspace2\HelloSpringMVC\src\test\SpringMVC\UserModel.java
import java.util.List;


public class UserModel {
    private List<User> users;

    public List<User> getUsers() {
        System.out.println("getUsers()");
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
        System.out.println("setUsers(users)");
    }

    public UserModel(List<User> users) {
        super();
        this.users = users;
        System.out.println("UserModel(users)");
    }

    public UserModel() {
        super();
        System.out.println("UserModel()");
    }

}

package test.SpringMVC;
//D:\Indigo_workspace2\HelloSpringMVC\src\test\SpringMVC\personController.java
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
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.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
//http://localhost:8080/HelloSpringMVC/person/showData

@Controller
@RequestMapping("/person")
public class personController {

  // http://localhost:8080/HelloSpringMVC/person/showData
  //使用modelAndView对象将数据传递到前台。
  //传递多个参数（不同类型的）
     @RequestMapping("/showData")
     public ModelAndView showData(){
        System.out.println("showData");
        
        String message = "这个是要传递的数据";
        
        User user = new User("张三", 12, new Date());
        
        List<User> us= new ArrayList<User>();
        us.add(new User("张三", 12, new Date()));
        us.add(new User("张四", 13, new Date()));
        us.add(new User("张五", 14, new Date()));
        
        ModelAndView mad = new ModelAndView("showData");
        //将数据存入modelMap
        mad.addObject("message", message);
        mad.addObject("user",user);//默认为类名的首字母小写
        mad.addObject("users", us);
        return mad;
    }
     
  // http://localhost:8080/HelloSpringMVC/postPerson.html
  // http://localhost:8080/HelloSpringMVC/person/toperson 
   //boxing automatically
     @RequestMapping(value = "/toperson", method ={RequestMethod.POST})
     @ResponseBody
     public String toPerson(UserModel users){
         
         String result = "";
         List<User> userList = users.getUsers();
         if(userList == null || userList.size() <= 0){ return "No any ID."; }
         User u=userList.get(0);
         result = u.getName()+" "+u.getAge();
         return result;         
     }

        
}

4种方法让SpringMVC接收多个对象

http://blog.csdn.net/lutinghuan/article/details/46820023

原创 2015年07月10日 09:08:24

问题背景：
我要在一个表单里同时一次性提交多名乘客的个人信息到SpringMVC，前端HTML和SpringMVC Controller里该如何处理？

第1种方法：表单提交，以字段数组接收；
第2种方法：表单提交，以BeanListModel接收；
第3种方法：将Json对象序列化成Json字符串提交，以List接收；
第4种方法：将表单对象序列化成Json字符串提交，以List接收；
第4种方法其实是第3种方法的升级，就是将表单转成Json对象，再转成Json字符串提交；
然而，第4种方法还不支持含有多选控件表单的提交，故应该还有第5种加强版的方法。

以上4种方法都共用同一个User实体类，代码如下：

public class User {

    private Integer id;
    private String name;
    private String pwd;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pwd='" + pwd + '\'' +
                '}';
    }
    // .......后面还有getter、setter方法，省略了
 }

第1种方法：表单提交，以字段数组接收
HTML代码如下：

    <form action="/user/submitUserList_1" method="post">
        ID:<input type="text" name="id"><br/>
        Username:<input type="text" name="name"><br/>
        Password:<input type="text" name="pwd"><br/><br/>

        ID:<input type="text" name="id"><br/>
        Username:<input type="text" name="name"><br/>
        Password:<input type="text" name="pwd"><br/><br/>
        <input type="submit" value="submit">
    </form>

Java代码如下：

    @RequestMapping(value = "/submitUserList_1", method ={RequestMethod.POST})
    @ResponseBody
    public String submitUserList_1(HttpServletResponse response,Integer[] id, String[] name, String[] pwd)
                            throws Exception{
        String result = "";
        if(id == null || id.length <= 0){ return "No any ID.中文"; }
        List<User> userList = new ArrayList<User>();
        for (int i = 0; i < id.length; i++ ) {
            User user = new User();
            user.setId(id[i]);
            user.setName(name[i]);
            user.setPwd(pwd[i]);
            userList.add(user);
        }
        result = this.showUserList(userList);
        return result;
    }

第2种方法：表单提交，以BeanListModel接收
HTML代码如下：

    <form action="/user/submitUserList_2" method="post">
        ID:<input type="text" name="users[0].id"><br/>
        Username:<input type="text" name="users[0].name"><br/>
        Password:<input type="text" name="users[0].pwd"><br/><br/>

        ID:<input type="text" name="users[2].id"><br/>
        Username:<input type="text" name="users[2].name"><br/>
        Password:<input type="text" name="users[2].pwd"><br/><br/>
        <input type="submit" value="Submit">
    </form>

Java代码：
除了刚才公用的User类，还要封装一个User的容器类UserModel：

public class UserModel {
    private List<User> users;

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }

    public UserModel(List<User> users) {
        super();
        this.users = users;
    }

    public UserModel() {
        super();
    }

}

SpringMVC Controller方法：

    @RequestMapping(value = "/submitUserList_2", method ={RequestMethod.POST})
    @ResponseBody
    public String submitUserList_2(UserModel users)
            throws Exception{
        String result = "";
        List<User> userList = users.getUsers();
        if(userList == null || userList.size() <= 0){ return "No any ID.中文"; }
        result = this.showUserList(userList);
        return result;
    }

第3种方法：将Json对象序列化成Json字符串提交，以List接收
HTML代码：

<head>
    <title>submitUserList_3</title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <script language="JavaScript" src="/js/jquery.min.js" ></script>
    <script language="JavaScript" src="/js/jquery.json.min.js" ></script>
    <script type="text/javascript" language="JavaScript">
        function submitUserList_3() {alert("ok");
            var customerArray = new Array();
            customerArray.push({id: "1", name: "李四", pwd: "123"});
            customerArray.push({id: "2", name: "张三", pwd: "332"});
            $.ajax({
                url: "/user/submitUserList_3",
                type: "POST",
                contentType : 'application/json;charset=utf-8', //设置请求头信息
                dataType:"json",
                //data: JSON.stringify(customerArray),    //将Json对象序列化成Json字符串，JSON.stringify()原生态方法
                data: $.toJSON(customerArray),            //将Json对象序列化成Json字符串，toJSON()需要引用jquery.json.min.js
                success: function(data){
                    alert(data);
                },
                error: function(res){
                    alert(res.responseText);
                }
            });
        }
    </script>
</head>

<body>
    <h1>submitUserList_3</h1>
    <input id="submit" type="button" value="Submit" onclick="submitUserList_3();">
</body>

Java代码：

    @RequestMapping(value = "/submitUserList_3", method ={RequestMethod.POST})
    @ResponseBody
    public String submitUserList_3(@RequestBody List<User> users)
            throws Exception{
        String result = "";
        if(users == null || users.size() <= 0){ return "No any ID.中文"; }
        result = this.showUserList(users);
        return result;
    }

第4种方法：将表单对象序列化成Json字符串提交，以List接收
HTML代码：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <title>submitUserList_4</title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <script language="JavaScript" src="/js/jquery.min.js" ></script>
    <script type="text/javascript" language="JavaScript">
        //将表单序列化成json格式的数据(但不适用于含有控件的表单，例如复选框、多选的select)
        (function($){
            $.fn.serializeJson = function(){
                var jsonData1 = {};
                var serializeArray = this.serializeArray();
                // 先转换成{"id": ["12","14"], "name": ["aaa","bbb"], "pwd":["pwd1","pwd2"]}这种形式
                $(serializeArray).each(function () {
                    if (jsonData1[this.name]) {
                        if ($.isArray(jsonData1[this.name])) {
                            jsonData1[this.name].push(this.value);
                        } else {
                            jsonData1[this.name] = [jsonData1[this.name], this.value];
                        }
                    } else {
                        jsonData1[this.name] = this.value;
                    }
                });
                // 再转成[{"id": "12", "name": "aaa", "pwd":"pwd1"},{"id": "14", "name": "bb", "pwd":"pwd2"}]的形式
                var vCount = 0;
                // 计算json内部的数组最大长度
                for(var item in jsonData1){
                    var tmp = $.isArray(jsonData1[item]) ? jsonData1[item].length : 1;
                    vCount = (tmp > vCount) ? tmp : vCount;
                }

                if(vCount > 1) {
                    var jsonData2 = new Array();
                    for(var i = 0; i < vCount; i++){
                        var jsonObj = {};
                        for(var item in jsonData1) {
                            jsonObj[item] = jsonData1[item][i];
                        }
                        jsonData2.push(jsonObj);
                    }
                    return JSON.stringify(jsonData2);
                }else{
                    return "[" + JSON.stringify(jsonData1) + "]";
                }
            };
        })(jQuery);

        function submitUserList_4() {alert("ok");
            var jsonStr = $("#form1").serializeJson();
            //console.log("jsonStr:\r\n" + jsonStr);
            //alert(jsonStr);
            $.ajax({
                url: "/user/submitUserList_4",
                type: "POST",
                contentType : 'application/json;charset=utf-8', //设置请求头信息
                dataType:"json",
                data: jsonStr,
                success: function(data){
                    alert(data);
                },
                error: function(res){
                    alert(res.responseText);
                }
            });
        }
    </script>
</head>

<body>
    <h1>submitUserList_4</h1>
    <form id="form1">
        ID:<input type="text" name="id"><br/>
        Username:<input type="text" name="name"><br/>
        Password:<input type="text" name="pwd"><br/><br/>

        ID:<input type="text" name="id"><br/>
        Username:<input type="text" name="name"><br/>
        Password:<input type="text" name="pwd"><br/><br/>
        <input type="button" value="submit" onclick="submitUserList_4();">
    </form>
</body>
</html>

Java代码：

    @RequestMapping(value = "/submitUserList_4", method ={RequestMethod.POST})
    @ResponseBody
    public String submitUserList_4(@RequestBody List<User> users)
            throws Exception{
        String result = "";
        if(users == null || users.size() <= 0){ return "No any ID.中文"; }
        result = this.showUserList(users);
        return result;
    }

总结：
第1、2种方法其实都有一个共同的BUG：假如提交三条记录时，前面两条记录的某些字段不填值的话，在SpringMVC里接收不准确了。而且，每2种方法在HMTL中需要给name属性添加[下标]，如果下标有跨度的话（比如第一组控件下标是0,第二组下标是2），那么SpringMVC里其实的是0到2三个对象的，默认下标是1的那个对象全为null值。
第3、4种方法最实用。

以上方法参考自以下URL：
http://www.cnblogs.com/wsw0515/p/3582627.html
http://www.oschina.net/question/917732_106601
http://jxd-zxf.iteye.com/blog/2072300
http://www.tashan10.com/jquery-jiang-biao-dan-xu-lie-hua-wei-jsondui-xiang/

posted @ 2018-01-09 20:02 sky20080101 阅读(173) 评论(0) 收藏举报

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4种方法让SpringMVC接收多个对象

4种方法让SpringMVC接收多个对象

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