Java Json作为Grails控制器的参数
我试图将Json数组传递给Grails控制器,然后传递给Java类。但是,我不知道如何正确地将参数传递给Java类。这是相关代码 阿贾克斯邮报:Java Json作为Grails控制器的参数,java,jquery,ajax,json,grails,Java,Jquery,Ajax,Json,Grails,我试图将Json数组传递给Grails控制器,然后传递给Java类。但是,我不知道如何正确地将参数传递给Java类。这是相关代码 阿贾克斯邮报: $('#matrixForm').submit(function(e) { e.preventDefault(); var matrixArray = $(this).serializeArray(); $.ajax({ type: "POST", data: matrix
$('#matrixForm').submit(function(e) {
e.preventDefault();
var matrixArray = $(this).serializeArray();
$.ajax({
type: "POST",
data: matrixArray,
url: "/turingpages/factorize/create",
success: function(data) {
//USE DATA
}
});
});
Grails控制器:
...
def create() {
MatrixFactorization m = new MatrixFactorization(params)
Gson gson = new Gson()
def jsonMatrix = gson.toJson(m.answer)
render jsonMatrix
}
...
矩阵工厂化构造函数:
public MatrixFactorization(JsonElement jsonarray) {
BlockRealMatrix R = GsonMatrix.toMatrix(jsonarray);
this.run(R);
}
我的控制台将我的Json数组显示为:
[{name:"00", value:"1"}, {name:"01", value:"2"}, {name:"02", value:"3"}, {name:"10", value:"4"}, {name:"11", value:"0"}, {name:"12", value:"4"}, {name:"20", value:"0"}, {name:"21", value:"4"}, {name:"22", value:"2"}]
我的堆栈跟踪是:
| Error 2013-01-18 00:30:23,792 [http-bio-8080-exec-4] ERROR errors.GrailsExceptionResolver - GroovyRuntimeException occurred when processing request: [POST] /turingpages/factorize/create - parameters:
21: 4
20: 0
10: 4
22: 2
00: 1
01: 2
11: 0
02: 3
12: 4
failed to invoke constructor: public matrices.MatrixFactorization(com.google.gson.JsonElement) with arguments: [] reason: java.lang.IllegalArgumentException: wrong number of arguments. Stacktrace follows:
Message: failed to invoke constructor: public matrices.MatrixFactorization(com.google.gson.JsonElement) with arguments: [] reason: java.lang.IllegalArgumentException: wrong number of arguments
Line | Method
->> 15 | create in turingpages.rest.MFController$$ENuqtska
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| 195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter
| 63 | doFilter in grails.plugin.cache.web.filter.AbstractFilter
| 1110 | runWorker in java.util.concurrent.ThreadPoolExecutor
| 603 | run . . . in java.util.concurrent.ThreadPoolExecutor$Worker
^ 722 | run in java.lang.Thread
我对使用JSON非常陌生。感谢您的帮助。谢谢。1
默认情况下,jQuery将此数据作为请求参数传递,而不是JSON。因此,您应该构建一个JSON字符串来传递给jQuery。我可以推荐你。在这种情况下,它将是:
$.ajax({
type: "POST",
data: JSON.stringify(matrixArray),
url: "/turingpages/factorize/create",
success: function(data) {
//USE DATA
}
});
二,
在服务器端,您还可以使用标准的GrailsJSON转换器(但如果愿意,您可以使用Gson),请参阅
在这种情况下,您可以使用
def create() {
MatrixFactorization m = new MatrixFactorization(request.JSON)
render m.answer as JSON
}
当我使用stringify时,我的request.JSON是一个空对象:
[15:52:12.302]{“array”:[[1,2,3],[3,4,5],[5,6,7]}@http://localhost:8080/turingpages/js/dataFeed.js:15 [15:52:12.499]邮政http://localhost:8080/turingpages/factorize/create [HTTP/1.1200OK 18ms][15:52:12.528]{} @ http://localhost:8080/turingpages/js/dataFeed.js:22
上面的日志是请求前数组的打印输出和返回的打印输出。在grails控制器中,我只是返回request.JSONTry以添加contentType:'application/json'
和dataType:'json'
选项