Java中Json的序列化和反序列化

Java JSON序列化与反序列化
本文介绍了一种在Java中实现JSON序列化和反序列化的实用方法,包括简单的实体类转换及含有复杂类型的实体类转换。同时提供了将字符串转换为List的方法,并考虑了属性中包含实体类的情况。
      /**
	 * 由字符串反序列化成实体类  针对的是一个实体,此实体中的属性不包括自定义的类型,如Teacher类型,或者List<Teacher>类型 
	 * @param source 传入json中的字符串
	 * @param beanClass 实体类的类型
	 * @return 实体类
	 */
	public static Object getObjFromJsonArrStr(String source,Class beanClass)
	{
		JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(source);
		return  JSONObject.toBean(jsonObject,beanClass);		
	}
	/**
	 * 由字符串反序列化成实体类  针对的是一个实体,此实体中的属性包括自定义的类型,如Teacher类型,或者List<Teacher>类型
	 * @param jsonArrStr
	 * @param clazz
	 * @param classMap
	 * @return
	 */
	public static Object getObjFromJsonArrStr(String jsonArrStr, Class clazz, Map classMap) 
	{  
		JSONObject jsonObj = JSONObject.fromObject(jsonArrStr);  
                return JSONObject.toBean(jsonObj, clazz, classMap);            
	}

	
	/**
	 * 将string转换成listBean
	 * @param jsonArrStr 需要反序列化的字符串
	 * @param clazz 被反序列化之后的类
	 * @return 实体list
	 */
	@SuppressWarnings("unchecked")
	public static List getListFromJsonArrStr(String jsonArrStr, Class clazz) {  
        JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);  
        List list = new ArrayList();  
        for (int i = 0; i < jsonArr.size(); i++) 
        {  
            list.add(JSONObject.toBean(jsonArr.getJSONObject(i), clazz));  
        }  
        return list;  
    } 

	/**
	 * 将string转换成listBean 属性中包含实体类等 如List<Student> 而Student中含有属性List<Teacher>
	 * @param jsonArrStr 需要反序列化的字符串
	 * @param clazz 反序列化后的类
	 * @param classMap 将属性中包含的如Teacher加入到一个Map中,格式如map.put("teacher",Teacher.class)
	 * @return 反序列化后的字符串
	 * 使用示例:
		Map classMap = new HashMap();
		//必须要对Parent进行初始化 否则不识别
		Teacher p = new Teacher();
		classMap.put("teacher", p.getClass());
		List mlist = JSONTransfer.getListFromJsonArrStr(resultStr, Student.class, classMap);
	 */
	@SuppressWarnings("unchecked")
	public static List getListFromJsonArrStr(String jsonArrStr, Class clazz, Map classMap) 
	{  
       JSONArray jsonArr = JSONArray.fromObject(jsonArrStr);  
       List list = new ArrayList();  
       for (int i = 0; i < jsonArr.size(); i++) 
       {      	   
           list.add(JSONObject.toBean(jsonArr.getJSONObject(i), clazz, classMap));  
       }  
       return list;  
	}
		
	/**
	 * 序列化操作,无论是单个的对象,还是list,抑或是list中的属性仍包含list,都可以直接序列化成String类型
	 * @param obj 需要被序列化的对象
	 * @return 序列化之后的字符串
	 */
	@SuppressWarnings("unchecked")
	public static String getJsonArrStrFromList(Object obj) 
	{ 
		//返回結果
		String jsonStr = null;  
	    //判空
        if (obj == null) {  
            return "{}";  
        }  
        //Json配置      
        JsonConfig jsonCfg = new JsonConfig();  
  
        //注册日期处理器  
        jsonCfg.registerJsonValueProcessor(java.util.Date.class,  
                new JsonDateValueProcessor(SystemConstants.DateFormat));  
        
        //判断是否是list
        if (obj instanceof Collection || obj instanceof Object[]) {  
            jsonStr = JSONArray.fromObject(obj, jsonCfg).toString();  
        } else {  
            jsonStr = JSONObject.fromObject(obj, jsonCfg).toString();  
        }  	  
        return jsonStr; 
    } 

关于Java序列化,ITEye上有一篇讨论的帖子比较好http://www.iteye.com/topic/14707

转载于:https://www.cnblogs.com/luckyliu/archive/2012/04/05/2433682.html

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-IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/fatfs/src -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/freemodbus/common/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/idf_test/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/idf_test/include/esp32 -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/jsmn/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/json/cJSON -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/libsodium/libsodium/src/libsodium/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/libsodium/port_include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/mqtt/esp-mqtt/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/openssl/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/perfmon/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/spiffs/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/ulp/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/wifi_provisioning/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/button/button/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/rmaker_common/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/json_parser/upstream/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/json_parser/upstream -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/json_generator/upstream -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp_schedule/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp_rainmaker/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/qrcode/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/ws2812_led -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/dotprod/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/support/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/hann/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/blackman/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/blackman_harris/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/blackman_nuttall/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/nuttall/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/windows/flat_top/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/iir/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/fir/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/add/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/sub/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/mul/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/addc/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/mulc/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/math/sqrt/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/matrix/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/fft/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/dct/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/conv/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/common/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/kalman/ekf/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dsp/modules/kalman/ekf_imu13states/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp_littlefs/src -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp_littlefs/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/tool -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/typedef -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/image -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/math -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/nn -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/layer -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/detect -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-dl/include/model_zoo -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-sr/esp-tts/esp_tts_chinese/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp-sr/include/esp32 -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp32-camera/driver/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/esp32-camera/conversions/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/include/fb_gfx/include -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4/tools/sdk/esp32/qio_qspi/include -mlongcalls -Wno-frame-address -ffunction-sections -fdata-sections -Wno-error=unused-function -Wno-error=unused-variable -Wno-error=deprecated-declarations -Wno-unused-parameter -Wno-sign-compare -ggdb -Os -freorder-blocks -Wwrite-strings -fstack-protector -fstrict-volatile-bitfields -Wno-error=unused-but-set-variable -fno-jump-tables -fno-tree-switch-conversion -std=gnu++11 -fexceptions -fno-rtti -c -w -w -x c++ -E -CC -DF_CPU=240000000L -DARDUINO=10607 -DARDUINO_ESP32_DEV -DARDUINO_ARCH_ESP32 -DARDUINO_BOARD="ESP32_DEV" -DARDUINO_VARIANT="esp32" -DARDUINO_PARTITION_huge_app -DESP32 -DCORE_DEBUG_LEVEL=0 -DBOARD_HAS_PSRAM -mfix-esp32-psram-cache-issue -mfix-esp32-psram-cache-strategy=memw -DARDUINO_USB_CDC_ON_BOOT=0 @C:\Users\11016\AppData\Local\arduino\sketches\0EEE3D2B537D80DA7537EC51C47A096B/build_opt.h -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4\cores\esp32 -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4\variants\esp32 -IC:\Users\11016\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.4\libraries\WiFi\src -Ic:\Users\11016\Documents\Arduino\libraries\shibie_inferencing\src C:\Users\11016\AppData\Local\arduino\sketches\0EEE3D2B537D80DA7537EC51C47A096B\sketch\sketch_jul18c.ino.cpp -o C:\Users\11016\AppData\Local\Temp\3636765908\sketch_merged.cpp C:\Users\11016\Desktop\sketch_jul18c\sketch_jul18c.ino:287:6: error: #error "模型分辨率必须为320x240!" #error "模型分辨率必须为320x240!" ^~~~~ exit status 1 Compilation error: #error "模型分辨率必须为320x240!"
07-22
c:/users/admine/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: C:\Users\Admine\AppData\Local\Temp\arduino\sketches\6771204E390904AE789D4435BD203475\libraries\BluetoothSerial\BluetoothSerial.cpp.o:(.literal._ZL8_stop_btv+0x18): undefined reference to `esp_spp_disconnect' c:/users/admine/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: C:\Users\Admine\AppData\Local\Temp\arduino\sketches\6771204E390904AE789D4435BD203475\libraries\BluetoothSerial\BluetoothSerial.cpp.o:(.literal._ZL8_stop_btv+0x1c): undefined reference to `esp_spp_deinit' c:/users/admine/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: C:\Users\Admine\AppData\Local\Temp\arduino\sketches\6771204E390904AE789D4435BD203475\libraries\BluetoothSerial\BluetoothSerial.cpp.o:(.literal._ZL16_spp_send_bufferv+0xc): undefined reference to `esp_spp_write' c:/users/admine/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: C:\Users\Admine\AppData\Local\Temp\arduino\sketches\6771204E390904AE789D4435BD203475\libraries\BluetoothSerial\BluetoothSerial.cpp.o:(.literal._ZL8btSetPinv+0xc): undefined reference to `esp_bt_gap_set_pin' c:/users/admine/appdata/local/arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: C:\Users\Admine\AppData\Local\Temp\arduino\sketches\6771204E390904AE789D4435BD203475\libraries\BluetoothSerial\BluetoothSerial.cpp.o:(.literal._ZN15BluetoothSerial5beginE6Stringb+0x38): undefined reference to `esp_b
03-24
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