Java常用工具类---image图片处理工具类、Json工具类

package com.jarvis.base.util;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import net.coobird.thumbnailator.Thumbnails;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
*
*
* @Title: ImageHelper.java
* @Package com.jarvis.base.util
* @Description:图片处理工具类。
* @version V1.0
*/
@SuppressWarnings("restriction")
public class ImageHelper {
/**
* @描述：Base64解码并生成图片
* @入参：@param imgStr
* @入参：@param imgFile
* @入参：@throws IOException
* @出参：void
*/
public static void generateImage(String imgStr, String imgFile) throws IOException {
BASE64Decoder decoder = new BASE64Decoder();
// Base64解码
byte[] bytes;
OutputStream out = null;
try {
bytes = decoder.decodeBuffer(imgStr);
for (int i = 0; i < bytes.length; ++i) {
if (bytes[i] < 0) {// 调整异常数据
bytes[i] += 256;
}
}
// 生成图片
out = new FileOutputStream(imgFile);
out.write(bytes);
out.flush();
} catch (IOException e) {
throw new IOException();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

/**
* @throws IOException
* @描述：根据路径得到base编码后图片
* @入参：@param imgFilePath
* @入参：@return
* @出参：String
*/
public static String getImageStr(String imgFilePath) throws IOException {// 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
byte[] data = null;

// 读取图片字节数组
try {
InputStream in = new FileInputStream(imgFilePath);
data = new byte[in.available()];
in.read(data);
in.close();
} catch (IOException e) {
throw new IOException();
}

// 对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);// 返回Base64编码过的字节数组字符串
}

/**
* @throws IOException
* @描述：图片旋转
* @入参：@param base64In 传入的图片base64
* @入参：@param angle 图片旋转度数
* @入参：@throws Exception
* @出参：String 传出的图片base64
*/
public static String imgAngleRevolve(String base64In, int angle) throws IOException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
Thumbnails.of(base64ToIo(base64In)).scale(1.0).rotate(angle).toOutputStream(os);
} catch (IOException e) {
throw new IOException();
}
byte[] bs = os.toByteArray();
String s = new BASE64Encoder().encode(bs);
return s;
}

/**
* @描述：base64转为io流
* @入参：@param strBase64
* @入参：@return
* @入参：@throws IOException
* @出参：InputStream
*/
public static InputStream base64ToIo(String strBase64) throws IOException {
// 解码，然后将字节转换为文件
byte[] bytes = new BASE64Decoder().decodeBuffer(strBase64); // 将字符串转换为byte数组
return new ByteArrayInputStream(bytes);
}
}

package com.jarvis.base.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.alibaba.fastjson.serializer.JSONLibDataFormatSerializer;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;

/**
*
*
* @Title: FastJsonUtil.java
* @Package com.jarvis.base.util
* @Description:fastjson工具类
* @version V1.0
*/
public class FastJsonUtil {

private static final SerializeConfig config;

static {
config = new SerializeConfig();
config.put(java.util.Date.class, new JSONLibDataFormatSerializer()); // 使用和json-lib兼容的日期输出格式
config.put(java.sql.Date.class, new JSONLibDataFormatSerializer()); // 使用和json-lib兼容的日期输出格式
}

private static final SerializerFeature[] features = { SerializerFeature.WriteMapNullValue, // 输出空置字段
SerializerFeature.WriteNullListAsEmpty, // list字段如果为null，输出为[]，而不是null
SerializerFeature.WriteNullNumberAsZero, // 数值字段如果为null，输出为0，而不是null
SerializerFeature.WriteNullBooleanAsFalse, // Boolean字段如果为null，输出为false，而不是null
SerializerFeature.WriteNullStringAsEmpty, // 字符类型字段如果为null，输出为""，而不是null
SerializerFeature.PrettyFormat //是否需要格式化输出Json数据
};

/**
* @param object
* @return Return:String Description:将对象转成成Json对象
*/
public static String toJSONString(Object object) {
return JSON.toJSONString(object, config, features);
}

/**
* @param object
* @return Return:String Description:使用和json-lib兼容的日期输出格式
*/
public static String toJSONNoFeatures(Object object) {
return JSON.toJSONString(object, config);
}

/**
* @param jsonStr
* @return Return:Object Description:将Json数据转换成JSONObject
*/
public static JSONObject toJsonObj(String jsonStr) {
return (JSONObject) JSON.parse(jsonStr);
}

/**
* @param jsonStr
* @param clazz
* @return Return:T Description:将Json数据转换成Object
*/
public static <T> T toBean(String jsonStr, Class<T> clazz) {
return JSON.parseObject(jsonStr, clazz);
}

/**
* @param jsonStr
* @return Return:Object[] Description:将Json数据转换为数组
*/
public static <T> Object[] toArray(String jsonStr) {
return toArray(jsonStr, null);
}

/**
* @param jsonStr
* @param clazz
* @return Return:Object[] Description:将Json数据转换为数组
*/
public static <T> Object[] toArray(String jsonStr, Class<T> clazz) {
return JSON.parseArray(jsonStr, clazz).toArray();
}

/**
* @param jsonStr
* @param clazz
* @return Return:List<T> Description:将Json数据转换为List
*/
public static <T> List<T> toList(String jsonStr, Class<T> clazz) {
return JSON.parseArray(jsonStr, clazz);
}

/**
* 将javabean转化为序列化的JSONObject对象
*
* @param keyvalue
* @return
*/
public static JSONObject beanToJsonObj(Object bean) {
String jsonStr = JSON.toJSONString(bean);
JSONObject objectJson = (JSONObject) JSON.parse(jsonStr);
return objectJson;
}
/**
* json字符串转化为map
*
* @param s
* @return
*/
public static Map<?, ?> stringToCollect(String jsonStr) {
Map<?, ?> map = JSONObject.parseObject(jsonStr);
return map;
}

/**
* 将map转化为string
*
* @param m
* @return
*/
public static String collectToString(Map<?, ?> map) {
String jsonStr = JSONObject.toJSONString(map);
return jsonStr;
}

/**
* @param t
* @param file
* @throws IOException
* Return:void Description:将对象的Json数据写入文件。
*/
public static <T> void writeJsonToFile(T t, File file) throws IOException {
String jsonStr = JSONObject.toJSONString(t, SerializerFeature.PrettyFormat);
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));
bw.write(jsonStr);
bw.close();
}

/**
* @param t
* @param filename
* @throws IOException
* Return:void Description:将对象的Json数据写入文件。
*/
public static <T> void writeJsonToFile(T t, String filename) throws IOException {
writeJsonToFile(t, new File(filename));
}

/**
* @param cls
* @param file
* @return
* @throws IOException
* Return:T Description:将文件中的Json数据转换成Object对象
*/
public static <T> T readJsonFromFile(Class<T> cls, File file) throws IOException {
StringBuilder strBuilder = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
String line = null;
while ((line = br.readLine()) != null) {
strBuilder.append(line);
}
br.close();
return JSONObject.parseObject(strBuilder.toString(), cls);
}

/**
* Author:Jack Time:2017年9月2日下午4:22:30
*
* @param cls
* @param filename
* @return
* @throws IOException
* Return:T Description:将文件中的Json数据转换成Object对象
*/
public static <T> T readJsonFromFile(Class<T> cls, String filename) throws IOException {
return readJsonFromFile(cls, new File(filename));
}

/**
* Author:Jack Time:2017年9月2日下午4:23:06
*
* @param typeReference
* @param file
* @return
* @throws IOException
* Return:T Description:从文件中读取出Json对象
*/
public static <T> T readJsonFromFile(TypeReference<T> typeReference, File file) throws IOException {
StringBuilder strBuilder = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
String line = null;
while ((line = br.readLine()) != null) {
strBuilder.append(line);
}
br.close();
return JSONObject.parseObject(strBuilder.toString(), typeReference);
}

/**
* Author:Jack Time:2017年9月2日下午4:23:11
*
* @param typeReference
* @param filename
* @return
* @throws IOException
* Return:T Description:从文件中读取出Json对象
*/
public static <T> T readJsonFromFile(TypeReference<T> typeReference, String filename) throws IOException {
return readJsonFromFile(typeReference, new File(filename));
}

}

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