用JAVA给JSON进行排版

功能：可以把一行的JSON字符串格式化后进行输出，带有缩进，看起来更加直观。

        支持JSON格式的字符串和文件格式化输出。

package json;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import vote.Vote;

/**
* JSON打印器
* @author jiujie
* @version $Id: JSONPrinter.java, v 0.1 2016年7月28日 下午5:08:41 jiujie Exp $
*/
public class JSONPrinter {

private Object jsonObj;

/**
* JSON文件打印器
* constructor
* @author jiujie
* 2016年7月28日 下午5:08:59
* @param jsonFile
*/
public JSONPrinter(File jsonFile) {
this.jsonObj = jsonFile;
}

/**
* JSON字符串打印器
* constructor
* @author jiujie
* 2016年7月28日 下午5:08:59
* @param jsonString
*/
public JSONPrinter(String jsonString) {
this.jsonObj = jsonString;
}

public void print() {
if (jsonObj instanceof File) {
try {
print(new FileInputStream((File) jsonObj));
} catch (Exception e) {
e.printStackTrace();
}
} else if (jsonObj instanceof String) {
try {
print(new ByteArrayInputStream(((String) jsonObj).getBytes()));
} catch (Exception e) {
e.printStackTrace();
}
}
}

private void print(InputStream inputStream) throws IOException {

InputStreamReader in = new InputStreamReader(inputStream);
int read = 0;
int indent = 0;
while ((read = in.read()) > 0) {
char ch = (char) read;
switch (ch) {
case '{': {
indent = printAndRightMove(indent, ch);
break;
}
case '}': {
indent = printAndLeftMove(indent, ch);
break;
}
case '[': {
indent = printAndRightMove(indent, ch);
break;
}
case ']': {
indent = printAndLeftMove(indent, ch);
break;
}
case ',': {
System.out.println(ch);
System.out.print(getBlankString(indent));
break;
}
default: {
System.out.print(ch);
break;
}
}
}
in.close();
}

private int printAndLeftMove(int indent, char ch) {
System.out.println();
indent -= 2;
System.out.print(getBlankString(indent) + ch);
return indent;
}

private int printAndRightMove(int indent, char ch) {
System.out.println();
System.out.println(getBlankString(indent) + ch);
indent += 2;
System.out.print(getBlankString(indent));
return indent;
}

private String getBlankString(int length) {
if (length <= 0) {
return "";
}
String blankString = "";
for (int i = 0; i < length; i++) {
blankString += " ";
}
return blankString;
}

public static void main(String[] args) throws FileNotFoundException, IOException {
ClassLoader classLoader = Vote.class.getClassLoader();
String path = classLoader.getResource("").toString().replace("/bin", "").replace("file:/",
"") + "src/json/json.txt";
JSONPrinter jsonPrinter = new JSONPrinter(new File(path));
jsonPrinter.print();

JSONPrinter stringJsonPrinter = new JSONPrinter("{score:100,age:30}");
stringJsonPrinter.print();
}

}