输出java源文件所有普通字符串

    

package com.cn.fanjg.regex;

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @function：
 * com.cn.fanjg.regex
 * @author fanjg
 * @date : 2013-4-7 下午08:43:21
 */
public class PrintCommonString {
    public static void main(String[] args) {
        try {
            FileReader freader = new FileReader("./ThreadMain.java");
            BufferedReader breader = new BufferedReader(freader);
            StringBuilder sb = new StringBuilder();
            try {
                String temp = "";
                /**
                 * 读取文件内容，并将读取的每一行后都不加\n
                 * 其目的是为了在解析双反斜杠（//）注释时做注释中止符
                 */
                while((temp=breader.readLine())!= null)
                {
                    sb.append(temp);
                    sb.append('\n');
                }
                String src = sb.toString();
                /** 匹配左引号 **/
                Matcher leftQuoteMatcher = Pattern.compile("\"").matcher(src);
                Matcher rightQuoteMatcher = Pattern.compile("\"").matcher(src);
                int begin = 0;
                sb = new StringBuilder();
                while(leftQuoteMatcher.find(begin))
                {
                    //因为字符串的双引号是一样的 ，所以需要 在匹配右引号的开始位置为左引号位置+1
                    rightQuoteMatcher.find(leftQuoteMatcher.start()+1);
                    sb.append(src.substring(leftQuoteMatcher.start(), rightQuoteMatcher.end()));
                    sb.append('\n');
                    begin = rightQuoteMatcher.end();
                }
                System.out.println(sb.toString());
            } catch (IOException e) {
                System.out.println("文件读取失败");
            }finally
            {
                breader.close();
                freader.close();
            }
        } catch (FileNotFoundException e) {
            System.out.println("文件不存在");
        }catch(IOException e)
        {
            System.out.println("文件读取失败");
        }
    }

}