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:
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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:
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< 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:
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@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:
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< 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:
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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:
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@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:
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< 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: $.toJSON(customerArray), //将Json对象序列化成Json字符串,toJSON()需要引用jquery.json.min.js success: function(data){ alert(data); }, error: function(res){ alert(res.responseText); } }); } </ script > </ head > < body > < h1 >submitUserList_3</ h1 > < input id = "submit" type = "button" value = "Submit" onclick = "submitUserList_3();" > </ body > |
Java代码:
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@RequestMapping (value = "/submitUserList_3" , method ={RequestMethod.POST}) @ResponseBody public String submitUserList_3( @RequestBody List<User> users) throws Exception{ String result = "" ; if (users == null || users.size() <= 0 ){ return "No any ID.中文" ; } result = this .showUserList(users); return result; } |
第4种方法:将表单对象序列化成Json字符串提交,以List接收
HTML代码:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> < html > < head > < title >submitUserList_4</ title > < meta http-equiv = "content-type" content = "text/html; charset=utf-8" > < script language = "JavaScript" src = "/js/jquery.min.js" ></ script > < script type = "text/javascript" language = "JavaScript" > //将表单序列化成json格式的数据(但不适用于含有控件的表单,例如复选框、多选的select) (function($){ $.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:
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@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。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。