Gson的简单使用

目录

• Gradle
• 初使化调用
  • Json数组字串转字符串数据
  • 字符串数组转Json数组字串
  • Json数组字串转List
• 实例：配置文件存储

Gradle

dependencies {
  implementation 'com.google.code.gson:gson:2.8.6'
}

初使化调用

Gson gson = new Gson();

Json数组字串转字符串数据

String jsonArray = "["https://github.com/leavesC","Java","Git","GitHub"]";
String[] strings = gson.fromJson(jsonArray, String[].class);

字符串数组转Json数组字串

String jsonArray = gson.toJson(strings, String[].class);

Json数组字串转List

List<String> stringList = gson.fromJson(jsonArray, new TypeToken<List<String>>(){}.getType());

实例：配置文件存储

//保存应用信息到本地文件
private void savePackageData() {
    try {
        FileOutputStream fout = openFileOutput("desktop_package.json", MODE_PRIVATE);
        BufferedOutputStream buffout = new BufferedOutputStream(fout);
        String jsonArray = gson.toJson(lstPackage, new TypeToken<List<Map<String, Object>>>() {
        }.getType());
        buffout.write(jsonArray.getBytes());
        buffout.close();
    } catch (Exception e) {
        log(e.getMessage());
    }
}

String jsonArray = getFileContent("desktop_package.json");
if(!jsonArray.equals("")) lstPackage = gson.fromJson(jsonArray, new TypeToken<List<Map<String, Object>>>(){}.getType());