Java中的JSON序列化和反序列化例子:
package
cn.fiyo.base.util;
import
java.io.IOException;
import
java.io.PrintWriter;
import
java.text.SimpleDateFormat;
import
java.util.*;
import
javax.servlet.http.HttpServletRequest;
import
javax.servlet.http.HttpServletResponse;
import
org.apache.commons.beanutils.BeanUtils;
import
org.apache.commons.logging.Log;
import
org.apache.commons.logging.LogFactory;
import
org.springframework.beans.propertyeditors.CustomDateEditor;
import
org.springframework.beans.propertyeditors.StringTrimmerEditor;
import
org.springframework.web.bind.ServletRequestDataBinder;
import
cn.easecom.platform.module.basic.web.user.UserContext;
import
net.sf.json.JSONArray;
import
net.sf.json.JSONObject;
public
class
JsonUtils {
private
static
final
Log log = LogFactory.getLog(JsonUtils.
class
);
public
JsonUtils() {
}
/**
* 向客户端输出JSON
*/
public
static
void
outputJson(HttpServletResponse response, JSONObject json)
throws
Exception {
response.setCharacterEncoding(
"UTF-8"
);
PrintWriter out = response.getWriter();
out.write(json.toString());
out.flush();
}
/**
* 从一个JSON 对象字符格式中得到一个java对象
*
*/
public
static
Object toBean(String jsonString, Class beanClass) {
JSONObject jsonObject = JSONObject.fromObject(jsonString);
Object object = JSONObject.toBean(jsonObject, beanClass);
return
object;
}
public
static
Object toBean(String jsonString, Class beanClass,Map map) {
JSONObject jsonObject = JSONObject.fromObject(jsonString);
Object object = JSONObject.toBean(jsonObject, beanClass,map);
return
object;
}
/**
* 从json对象集合表达式中得到一个java对象列表
* @param jsonString:数组字符串[{key1:value1,key2:value2},{bean2},{bean3},...]
* @param pojoClass
* @return
*/
public
static
List toList(String jsonString, Class beanClass) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
List list =
new
ArrayList();
for
(
int
i =
0
; i < jsonArray.size(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Object object = JSONObject.toBean(jsonObject, beanClass);
list.add(object);
}
return
list;
}
public
static
List toList(String jsonString, Class beanClass,Map map) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
List list =
new
ArrayList();
for
(
int
i =
0
; i < jsonArray.size(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
Object object = JSONObject.toBean(jsonObject, beanClass,map);
list.add(object);
}
return
list;
}
/**
* 从json字符串中获取一个map,该map支持嵌套功能
* @param jsonString
* @return
*/
public
static
Map toMap(String jsonString) {
JSONObject jsonObject = JSONObject.fromObject(jsonString);
Iterator it = jsonObject.keys();
Map map =
new
HashMap();
while
(it.hasNext()) {
String key = (String) it.next();
Object value = jsonObject.get(key);
map.put(key, value);
}
return
map;
}
/**
* 从json数组中得到相应java数组
* @param jsonString
* @return
*/
public
static
Object[] toObjectArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
return
jsonArray.toArray();
}
/**
* 从json解析出java字符串数组
* @param jsonString
* @return
*/
public
static
String[] toStringArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
String[] stringArray =
new
String[jsonArray.size()];
for
(
int
i =
0
; i < jsonArray.size(); i++) {
stringArray[i] = jsonArray.getString(i);
}
return
stringArray;
}
/**
* 从json解析出javaLong型对象数组
* @param jsonString
* @return
*/
public
static
Long[] toLongArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Long[] longArray =
new
Long[jsonArray.size()];
for
(
int
i =
0
; i < jsonArray.size(); i++) {
longArray[i] = jsonArray.getLong(i);
}
return
longArray;
}
/**
* 从json解析出java Integer型对象数组
* @param jsonString:[1,2,3,4]
* @return
*/
public
static
Integer[] toIntegerArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Integer[] integerArray =
new
Integer[jsonArray.size()];
for
(
int
i =
0
; i < jsonArray.size(); i++) {
integerArray[i] = jsonArray.getInt(i);
}
return
integerArray;
}
/**
* 从json中解析出java Double型对象数组
* @param jsonString
* @return
*/
public
static
Double[] toDoubleArray(String jsonString) {
JSONArray jsonArray = JSONArray.fromObject(jsonString);
Double[] doubleArray =
new
Double[jsonArray.size()];
for
(
int
i =
0
; i < jsonArray.size(); i++) {
doubleArray[i] = jsonArray.getDouble(i);
}
return
doubleArray;
}
/**
* 将java对象转换成json字符串
* @param javaObj
* @return
*/
public
static
String toJsonString(Object object) {
JSONObject json = JSONObject.fromObject(object);
return
json.toString();
}
/*
* 将java对象转化为json数组字符串
* [{"name":"name1","id":"id1"},{"name":"name2","id":"id2"}]
*/
public static String toJsonArrayString(List
JSONArray jsonArray = JSONArray.fromObject(list);
return jsonArray.toString();
}
private String dateFormat = "yyyy-MM-dd";
public void setDateFormat(String dateFormat){
this.dateFormat = dateFormat;
}
/**
* 格式化日期字符串
*/
public void initBinder(HttpServletRequest request,ServletRequestDataBinder binder){
SimpleDateFormat dateFormat = new SimpleDateFormat(this.dateFormat);
dateFormat.setLenient(false);
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, false));
binder.registerCustomEditor(String.class,new StringTrimmerEditor(false));
}
@SuppressWarnings("unchecked")
public static void outputJsonResponse(HttpServletResponse response,boolean result){
JSONObject json = new JSONObject();
json.put("result", result);
String content=json.toString();
flushResponse(response,content);
}
/*
* {"result":true,"msg":"abc"}
*/
@SuppressWarnings("unchecked")
public static void outputJsonResponse(HttpServletResponse response,boolean result,String message){
JSONObject json = new JSONObject();
json.put("result", result);
json.put("message", message);
String content=json.toString();
flushResponse(response,content);
}
@SuppressWarnings("unchecked")
public static void outputJsonResponse(HttpServletResponse response,boolean result,String message,String userData){
JSONObject json = new JSONObject();
json.put("result", result);
json.put("message", message);
json.put("userData", userData);
String content=json.toString();
flushResponse(response,content);
}
/*
* {"result":true,"data":{"key1":"value1","key2":"value2"}}
*/
@SuppressWarnings("unchecked")
public static void outputJsonResponse(HttpServletResponse response,boolean result,String message,Map userData){
JSONObject json = new JSONObject();
json.put("result", result);
json.put("message", message);
if(userData!=null && userData.size()>0)
json.put("userData", userData);
String content=json.toString();
flushResponse(response,content);
}
/*
* 输出json数据
* 输出格式为:{result:true,data:[{"name":"name1","id":"id1"},{"name":"name2","id":"id2"}]}
*/
public static void outputJsonResponse(HttpServletResponse response,boolean result,List list) {
JSONObject json = new JSONObject();
json.put("result", result);
if (list!=null && list.size()>0){
JSONArray jsonArray = JSONArray.fromObject(list);
json.put("data", jsonArray);
}
String content=json.toString();
flushResponse(response,content);
}
/*
* 输出ext列表的json数据
* 输出格式为:{totalProperty:12,root:[{"name":"name1","id":"id1"},{"name":"name2","id":"id2"}]}
*/
public static void outputJsonDataForExt(HttpServletResponse response,int totalProperty,List list) {
JSONObject json = new JSONObject();
json.put("totalProperty", totalProperty);
if (list!=null && list.size()>0){
JSONArray jsonArray = JSONArray.fromObject(list);
json.put("root", jsonArray);
}
String content=json.toString();
flushResponse(response,content);
}
/**
* Method to flush a String as response.
* @param response
* @param responseContent
* @throws IOException
*/
public static void flushResponse(HttpServletResponse response,String responseContent){
response.setCharacterEncoding("UTF-8");
try {
PrintWriter writer = response.getWriter();
writer.write(responseContent);
writer.flush();
writer.close();
} catch (IOException e) {
log.error(e.getMessage());
}
}
/**
* @param response
*/
public static void outputXML(HttpServletResponse response, String xml) throws Exception {
response.setContentType("text/xml; charset=UTF-8");
PrintWriter out = response.getWriter();
out.write(xml);
out.flush();
}
/*
* 属性拷贝
*/
public
void
copyProperties(Object dest, Object orig) {
try
{
BeanUtils.copyProperties(dest, orig);
}
catch
(Exception ex) {
log.error(
"Copy property error: "
+ ex.toString());
}
}
}