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4种方法让SpringMVC接收多个对象

问题背景:
我要在一个表单里同一时候一次性提交多名乘客的个人信息到SpringMVC,前端HTML和SpringMVC Controller里该怎样处理?

  • 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种方法事实上是第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,代码例如以下:

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代码例如以下:

    <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代码例如以下:

    @RequestMapping(value = http://www.mamicode.com/"/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代码例如以下:

    <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 = http://www.mamicode.com/"/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()须要引用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 = http://www.mamicode.com/"/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,比如复选框、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"]}这样的形式
                $(serializeArray).each(function () {
                    if (jsonData1[this.name]) {
                        if ($.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 = http://www.mamicode.com/"/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种方法事实上都有一个共同的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。并且,每2种方法在HMTL中须要给name属性加入[下标],假设下标有跨度的话(比方第一组控件下标是0,第二组下标是2),那么SpringMVC里事实上的是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种方法最有用。

以上方法參考自下面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/

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4种方法让SpringMVC接收多个对象