Json(org.json)简单封装与解析

数据的解析与封装在Android开发中是很长见得问题，今天就和大家共同学习一下Json（org.json）的简单应用；就以下面的字符串为实例：

{

"owner": "张三",

"statusCode": 1,

"policyId": "18510060885",

"seqNo": true,

"msg": false,

"status": 0

"insuranceInfo": {

"companyName": "李四",

"companyCode": 12345

"additional": [ { "insuranceCode": "2345", "selected": true, "options": [ { "value": "key", "value": "key" } ], "diffPrice": 567 } ],

"primary": [ {

"amount": 6656,

"insuranceCode": 4566,

"des": "babababa",

"selected": "555",

"buyRate": "45%",

"insuranceName": "王五",

"options": [ { "value": "value", "key": "key" } ] } ],

"totalPrice": { "businessPrice": 345, "exemptPrice": "977" },

},

}

首先建一个Activity项目，xml中包含两个Button按钮和一个TextView，Button1用来显示封装的字符串内容，Button2用来显示解析的内容，代码如下按照上面的层次关系依次进行封装：

JSONObject createJSONObject() {
jsonObject = new JSONObject();
try {
jsonObject.put("status", 0);
jsonObject.put("statusCode", 1);
jsonObject.put("msg", false);
jsonObject.put("seqNo", true);
jsonObject.put("policyId", "18510060885");
jsonObject.put("owner", "张三");

JSONObject insuranceInfo = new JSONObject();
insuranceInfo.put("companyCode", 12345);
insuranceInfo.put("companyName", "李四");
JSONObject totalPrice = new JSONObject();
totalPrice.put("businessPrice", 345);
totalPrice.put("exemptPrice", "977");
insuranceInfo.put("totalPrice", totalPrice);

JSONArray primary = new JSONArray();
JSONObject js = new JSONObject();
js.put("insuranceCode", 4566);
js.put("amount", 6656);
js.put("insuranceName", "王五");
js.put("selected", "555");
js.put("des", "babababa");
js.put("buyRate", "45%");

JSONArray options = new JSONArray();
JSONObject json = new JSONObject();
json.put("value", "key");
json.put("value", "key");
options.put(json);

js.put("options", options);

primary.put(js);
insuranceInfo.put("primary", primary);

JSONArray additional = new JSONArray();
JSONObject addi = new JSONObject();
addi.put("insuranceCode", "2345");
addi.put("selected", true);
addi.put("diffPrice", 567);
JSONArray option = new JSONArray();
JSONObject j = new JSONObject();
j.put("value", "key");
j.put("value", "key");
option.put(j);
addi.put("options", option);
additional.put(addi);

insuranceInfo.put("additional", additional);

jsonObject.put("insuranceInfo", insuranceInfo);
} catch (JSONException e) {
e.printStackTrace();
}

对于层级的嵌套先定义好外层的数据类型再逐一进行添加，最后通过toString()方法在TextView中展示出来如下图。

接下来再把刚才封装的东西解析出来：

这里解析后我只从外到内层取个别字段进行打印

private void jsonAnalysis(JSONObject jsonObject) {
String string = jsonObject.toString();
try {
JSONObject jsonObjec = new JSONObject(string);
final int status = (int) jsonObjec.opt("status");
int statusCode = (int) jsonObjec.opt("statusCode");
boolean msg = (boolean) jsonObjec.opt("msg");
boolean seqNo = (boolean) jsonObjec.opt("seqNo");
final String policyld = (String) jsonObjec.opt("policyId");
String owner = (String) jsonObjec.opt("owner");

JSONObject insuranceInfo = jsonObjec.optJSONObject("insuranceInfo");
int companyCode = (int) insuranceInfo.opt("companyCode");
String companyName = (String) insuranceInfo.opt("companyName");
JSONObject totalPrice = insuranceInfo.optJSONObject("totalPrice");
int businessPrice = (int) totalPrice.opt("businessPrice");
String exemptPrice = (String) totalPrice.opt("exemptPrice");

JSONArray primary = insuranceInfo.optJSONArray("primary");
for (int i = 0; i < primary.length(); i++) {
JSONObject json = primary.getJSONObject(i);
final int insuranceCode = (int) json.opt("insuranceCode");
final String insuranceName = (String) json.opt("insuranceName");
JSONArray options = json.optJSONArray("options");
for (int j = 0; j < options.length(); j++) {
JSONObject jS = options.optJSONObject(i);
String key = (String) jS.opt("key");
final String value = (String) jS.opt("value");

button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
text.setText(status + "+" + policyld + "+" + insuranceCode + "+" + insuranceName + "+" + value);
}
});
}

}

} catch (JSONException e) {
e.printStackTrace();
}

这里需要注意一下，解析时可以使用opt 与 get这两种形式， 不过一般还是选择opt方法，因为get方法如果其内容为空时会直接抛出异常。导致程序崩溃；