Gson可以实现对象与json字符串之间的转化，以下是在Android中的示例代码。
Gson主页：https://code.google.com/p/google-gson/
public class GsonActivity extends Activity {
Button saveButton;
Button loadButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gsonlayout);
initControls();
}
protected void initControls(){
saveButton = (Button) findViewById(R.id.btSave);
loadButton = (Button) findViewById(R.id.btGsonLoad);
saveButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
List<StudentInfo> studentInfos = new LinkedList<StudentInfo>() ;
StudentInfo s1 = new StudentInfo();
s1.setId(1);
s1.setName("张三");
s1.setAddress("武汉市");
s1.setPhone("12345671");
studentInfos.add(s1);
StudentInfo s2 = new StudentInfo();
s2.setId(2);
s2.setName("李四");
s2.setAddress("华工");
s2.setPhone("12345672");
studentInfos.add(s2);
Gson gson = new Gson();
String json = gson.toJson(studentInfos);
try {
FileOutputStream fs = openFileOutput("gsonconfig.xml", MODE_PRIVATE);
fs.write(json.getBytes());
fs.close();
Toast.makeText(GsonActivity.this, json, Toast.LENGTH_SHORT).show();
} catch (Exception e) {
Toast.makeText(GsonActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
});
loadButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
List<StudentInfo> studentInfos = new LinkedList<StudentInfo>();
String json = "";
try {
FileInputStream fileInputStream = openFileInput("gsonconfig.xml");
InputStreamReader inputStreamReader =new InputStreamReader(fileInputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
json = bufferedReader.readLine();
bufferedReader.close();
Gson gson = new Gson();
studentInfos = gson.fromJson(json, new TypeToken<List<StudentInfo>>() {
}.getType());
for (StudentInfo studentInfo : studentInfos) {
Toast.makeText(GsonActivity.this, studentInfo.toString(), Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}更多例子可以参见http://blog.csdn.net/lk_blog/article/details/7685169