将JSON响应从Servlet返回到Javascript/JSP页面
我想(事实上我知道!)我做错了,我试图将一些值填充到HashMap中,并将每个hasmap添加到将添加到JSON对象的列表中:将JSON响应从Servlet返回到Javascript/JSP页面,java,json,gson,Java,Json,Gson,我想(事实上我知道!)我做错了,我试图将一些值填充到HashMap中,并将每个hasmap添加到将添加到JSON对象的列表中: JSONObject json = new JSONObject(); try { Map address; List addresses = new ArrayList(); int count = 15; for (int i=0 ; i<count ; i++) { address = new Ha
JSONObject json = new JSONObject();
try
{
Map address;
List addresses = new ArrayList();
int count = 15;
for (int i=0 ; i<count ; i++)
{
address = new HashMap();
address.put("CustomerName" , "Decepticons" + i);
address.put("AccountId" , "1999" + i);
address.put("SiteId" , "1888" + i);
address.put("Number" , "7" + i);
address.put("Building" , "StarScream Skyscraper" + i);
address.put("Street" , "Devestator Avenue" + i);
address.put("City" , "Megatron City" + i);
address.put("ZipCode" , "ZZ00 XX1" + i);
address.put("Country" , "CyberTron" + i);
addresses.add(address);
}
json.put("Addresses", addresses);
}
catch (JSONException jse)
{
}
response.setContentType("application/json");
response.getWriter().write(json.toString());
注意JSON响应返回的很好,但它是一个字符串。非常感谢您的建议。我也开始使用谷歌Gson,但对这方面的知识不多。我认为您要做的是在JSON字符串返回XMLHttpRequest时将其转换为对象-正确吗
如果是这样的话,您需要将该字符串转换为JavaScript对象——请注意,这可能是不安全的,因为您相信JSON字符串不是恶意的,因此执行它。最好您可以使用jQuery的让它工作起来!我应该构建一个
JSONObject
s的JSONArray
,然后将数组添加到最终的“地址”JSONObject
。遵守以下规定:
JSONObject json = new JSONObject();
JSONArray addresses = new JSONArray();
JSONObject address;
try
{
int count = 15;
for (int i=0 ; i<count ; i++)
{
address = new JSONObject();
address.put("CustomerName" , "Decepticons" + i);
address.put("AccountId" , "1999" + i);
address.put("SiteId" , "1888" + i);
address.put("Number" , "7" + i);
address.put("Building" , "StarScream Skyscraper" + i);
address.put("Street" , "Devestator Avenue" + i);
address.put("City" , "Megatron City" + i);
address.put("ZipCode" , "ZZ00 XX1" + i);
address.put("Country" , "CyberTron" + i);
addresses.add(address);
}
json.put("Addresses", addresses);
}
catch (JSONException jse)
{
}
response.setContentType("application/json");
response.getWriter().write(json.toString());
JSONObject json=new JSONObject();
JSONArray addresses=新的JSONArray();
JSONObject地址;
尝试
{
整数计数=15;
对于(inti=0;i我使用了JSONObject,如下所示
JSONObject jsonReturn = new JSONObject();
NhAdminTree = AdminTasks.GetNeighborhoodTreeForNhAdministrator( connection, bwcon, userName);
map = new HashMap<String, String>();
map.put("Status", "Success");
map.put("FailureReason", "None");
map.put("DataElements", "2");
jsonReturn = new JSONObject();
jsonReturn.accumulate("Header", map);
List<String> list = new ArrayList<String>();
list.add(NhAdminTree);
list.add(userName);
jsonReturn.accumulate("Elements", list);
使用AngularJs从浏览器调用此Servlet,如下所示
$scope.GetNeighborhoodTreeUsingPost = function(){
alert("Clicked GetNeighborhoodTreeUsingPost : " + $scope.userName );
$http({
method: 'POST',
url : 'http://localhost:8080/EPortal/xlEPortalService',
headers: {
'Content-Type': 'application/json'
},
data : {
'action': 64,
'userName' : $scope.userName
}
}).success(function(data, status, headers, config){
alert("DATA.header.status : " + data.Header.Status);
alert("DATA.header.FailureReason : " + data.Header.FailureReason);
alert("DATA.header.DataElements : " + data.Header.DataElements);
alert("DATA.elements : " + data.Elements);
}).error(function(data, status, headers, config) {
alert(data + " : " + status + " : " + headers + " : " + config);
});
};
此代码正常工作,并在警报对话框中显示正确的数据:
Data.header.status:成功
Data.header.FailureReason:无
Data.header.DetailElements:2
Data.Elements:Coma分离的字符串值,即nAdminTree、userNameHi,我尝试过使用它,我得到的只是一个返回的对象-请看这个线程:这解释了我认为返回的是有效的JSON。但是,看起来它实际上是一个返回的字符串,所以我很难解析它-这就是我为什么这么做的原因这里提出的问题与尝试将JSON传递回我的JavaScript函数有关。问题是关于发送JSON编码的字符串,而不是如何在JavaScript中处理它。您不应该尝试自己创建JSON编码的字符串;如果您的服务器端代码没有提供库函数来正确编码对象转换为JSON编码的字符串。可能与如何在ajax中读取此内容重复,我尝试了alert(responsedata.Addresses.CustomerName);
mazing!我在GAE中使用了此选项,并与内置的import com.google.appengine.labs.repackaged.org.JSON.JSONObject
包配合使用,非常感谢。
response.setContentType("application/json");
response.getWriter().write(jsonReturn.toString());
$scope.GetNeighborhoodTreeUsingPost = function(){
alert("Clicked GetNeighborhoodTreeUsingPost : " + $scope.userName );
$http({
method: 'POST',
url : 'http://localhost:8080/EPortal/xlEPortalService',
headers: {
'Content-Type': 'application/json'
},
data : {
'action': 64,
'userName' : $scope.userName
}
}).success(function(data, status, headers, config){
alert("DATA.header.status : " + data.Header.Status);
alert("DATA.header.FailureReason : " + data.Header.FailureReason);
alert("DATA.header.DataElements : " + data.Header.DataElements);
alert("DATA.elements : " + data.Elements);
}).error(function(data, status, headers, config) {
alert(data + " : " + status + " : " + headers + " : " + config);
});
};