在使用 jersey restful 时 前端ajax post 数据到 服务器端，接收对象为null，测试代码

web:

   var ts = [];//模拟两条数据for (var i = 0; i < 2; i++) {ts.push({name:'name'+i,id:i});}var testData = {aa:ts};printLog('log',testData);$.rate.post({url: hostUrl + '/xxx/xxx/xxxx/queryDepartmentsAll',data:testData,cache: false,objRest:false,success: function(data) {console.log(data);}});

post data：

--- log ---
{"aa":[{"name":"name0","id":0},{"name":"name1","id":1}]}

server：

   /*** 查询所有科室* @return* @throws Exception*/@POST@Path("/queryDepartmentsAll")@Produces(MediaType.APPLICATION_JSON)@Consumes(MediaType.APPLICATION_FORM_URLENCODED)public String queryDepartmentsAllTest(@Form(prefix="aa")List<TestBean> beans) throws Exception { loggin.info(beans);return "test...";}

TestBean:

@XmlRootElement
public class TestBean {@FormParam("name")private String name;@FormParam("id")private Integer id;public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}}

有请 "debug " 出场.......

ajax发出请求后 会经过 HttpServletInputMessage 处理，获取表单带的参数

调用getDecodedFormParameters，会把 url中的参数和表单参数合并，放入MultivaluedMapImpl 对象中

MultivaluedMapImpl点toString - --> {aa[1][id]=[1], aa[0][name]=[name0], aa[0][id]=[0], aa[1][name]=[name1]}

往下走，到了ListFormInjector

form 注入器有两种，List，Map

最终走到了PrefixedMultivaluedMap 类

对象注入的方式是通过“变量[0].属性” 注入的，而前段传进的值是

解决办法：

把花括号改成“ .” 就可以注入了

修改后：

aa[0].id=0
aa[0].name=name0
aa[1].id=1
aa[1].name=name1

后端接收到了

====================================================================

jquery ajax data 如果对象中包涵数组，是使用 jQuery.param 函数格式化，所以导致 传输的数据格式不正确

jQuery.param = function( a, traditional ) {var prefix,s = [],add = function( key, value ) {// If value is a function, invoke it and return its valuevalue = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );};// Set traditional to true for jQuery <= 1.3.2 behavior.if ( traditional === undefined ) {traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;}// If an array was passed in, assume that it is an array of form elements.if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {// Serialize the form elementsjQuery.each( a, function() {add( this.name, this.value );});} else {// If traditional, encode the "old" way (the way 1.3.2 or older// did it), otherwise encode params recursively.for ( prefix in a ) {buildParams( prefix, a[ prefix ], traditional, add );}}// Return the resulting serializationreturn s.join( "&" ).replace( r20, "+" );
};

可以在请求前把data类型先处理，demo js

var datas = {};
for (var a in settings.data) {if ($.isArray(settings.data[a])) {var isObject = $.isPlainObject(settings.data[a][0]);//如果数组里是对象if (isObject) {for (var i = 0, ds = settings.data[a], len = ds.length; i < len; ++i) {for (var b in ds[i]) {datas[a + '[' + i + '].' + b] = ds[i][b];}}}} else {//datas[a] = settings.data[a];}
}