完美打印JSON

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package java2.format;import com.google.common.base.Strings;import com.google.common.collect.Lists;import org.apache.commons.io.FileUtils;import org.apache.commons.lang3.StringUtils;import java.io.File;import java.io.IOException;import java.nio.charset.Charset;import java.util.ArrayList;import java.util.List;/** * Created by fhqplzj on 17-2-23 at 下午12:08. */public class PrettyJSON {    public static List<String> formatJSON(String s) {        s = StringUtils.stripToEmpty(s);        ArrayList<String> result = Lists.newArrayList();        int level = 0;        StringBuilder stringBuilder = new StringBuilder();        for (char c : s.toCharArray()) {            if (stringBuilder.length() > 0 && stringBuilder.charAt(stringBuilder.length() - 1) == '\n') {                stringBuilder.append(Strings.repeat("\t", level));                /*去掉每一行开头的空白符*/                if (StringUtils.isBlank(Character.toString(c))) {                    continue;                }            }            switch (c) {                case '[':                case '{':                    stringBuilder.append(c).append('\n');                    level++;                    break;                case ',':                    stringBuilder.append(c).append('\n');                    break;                case ']':                case '}':                    stringBuilder.append('\n').append(Strings.repeat("\t", --level)).append(c);                    if (level == 0) {                        result.add(stringBuilder.toString());                        stringBuilder = new StringBuilder();                    }                    break;                default:                    stringBuilder.append(c);            }        }        return result;    }    public static List<String> formatJSON(File file) {        String s = null;        try {            s = FileUtils.readFileToString(file, Charset.defaultCharset());        } catch (IOException e) {            e.printStackTrace();        }        return formatJSON(s);    }    public static void main(String[] args) throws IOException {        List<String> result = formatJSON(new File("/tmp/json.txt"));        for (int i = 0; i < result.size(); i++) {            System.out.println(String.format("case %d:", i + 1));            System.out.println(StringUtils.stripToEmpty(result.get(i)));        }    }}
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