使用GWT中的Javascript覆盖类型创建JSON请求字符串 [英] Create JSON Request string using Javascript Overlay types in GWT

问题描述

我们已在GWT客户端中使用JSO进行JSON解析.现在，我们需要将Java对象转换为JSON字符串.我只是想了解，我们如何实现这一目标? JSO覆盖类型用于JSON解析.还可将其用于创建JSON请求字符串，还是必须通过其他方式?

We have used JSO for our JSON parsing in GWT client side. Now, we need to convert our Java objects to JSON string. I just wanted to understand, how we can achieve this? JSO overlay types was used for JSON parsing. Can it also be used to create a JSON request string or do we have to go by some other means?

推荐答案

在JavaScript中生成JSON对象非常简单.您可以这样做:

Generating a JSON object in JavaScript is pretty simple. You can do it like this:

var obj = { "var1": "hello", "var2": "world" };

这将生成一个带有两个变量(值"hello"，"world")的JSON对象("var1"和"var2"). 可以使用JSON.stringify(jso);方法将Object转换为String(用于发送).

this will generate a JSON object with two varibles ("var1" and "var2") with their values ("hello", "world"). The Object can be converted into a String (for sending purposes) with the JSON.stringify(jso); method.

由于无法将所有变量都优化为单个字符串，因此无法从Java代码生成JSON数据(也不会有有用的结果)，因此应用此方法将不会获得有用的结果(即使可能).

Generating JSON data from the java code isn't possible (well not with a usefull result) since all varibles are optimzed to single Strings, so applying this method wouldn't hava a usefull result (if even possible).

如果您已经有一个JSO对象(使用诸如safeeval之类的东西生成).您可以在此处编辑变量，如下所示:

If you have already a JSO object (generated with something like safeeval). You can edit your varibles there, like this:

public final native void newValue(String newValue) /*-{
    this.ValueName = newValue;
}-*/;

如果您随后希望将该对象作为字符串，则必须在JSO类中定义以下方法:

If you then want the object as string you have to define the following method in your JSO class:

    public final native String returnAsString () /*-{
    return JSON.stringify(this);
}-*/;

或在您的Java类String s = (new JSONObject(jso)).toString();中使用它.

or use this in you Java class: String s = (new JSONObject(jso)).toString();.

这样，您可以编辑原始输入数据并将原始对象发送回服务器.

This way you can edit your original intput data and send the original object back to the server.

BR

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