java读取配置文件(properties)的时候,unicode码转utf-8——java改变默认Unicode编码显示中文

系统管理员 2023-02-27 10:52 17阅读 0赞

有时我们在读取properties结尾的配置文件的时候,如果配置文件中有中文,那么我们读取到的是unicode码的中文,需要我们在转换一下,代码如下

/**
         * 将配置文件中的Unicode 转 utf-8 汉字 
         * @param 原始字符串
         * @return  转换后的格式的字符串
         */
        public static String unicodeToChina(String str) {    
            Charset set = Charset.forName("UTF-16");    
            Pattern p = Pattern.compile("\\\\u([0-9a-fA-F]{4})");    
            Matcher m = p.matcher( str );    
            int start = 0 ;    
            int start2 = 0 ;    
            StringBuffer sb = new StringBuffer();    
            while( m.find( start ) ) {    
                start2 = m.start() ;    
                if( start2 > start ){    
                    String seg = str.substring(start, start2) ;    
                    sb.append( seg );    
                }    
                String code = m.group( 1 );    
                int i = Integer.valueOf( code , 16 );    
                byte[] bb = new byte[ 4 ] ;    
                bb[ 0 ] = (byte) ((i >> 8) & 0xFF );    
                bb[ 1 ] = (byte) ( i & 0xFF ) ;    
                ByteBuffer b = ByteBuffer.wrap(bb);    
                sb.append( String.valueOf( set.decode(b) ).trim() );    
                start = m.end() ;    
            }    
            start2 = str.length() ;    
            if( start2 > start ){    
                String seg = str.substring(start, start2) ;    
                sb.append( seg );    
            }    
            return sb.toString() ;    
        }

测试  单个字段

public static void main(String[] args) {
               String str = unicodeToChina("\u672a\u6765");  
               System.out.println(str);  
        }

整个文件unicode不显示乱码，改变默认Unicode编码显示中文

public static void main(String[] args) throws IOException {
    
            BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(new File("src/project.properties"))));
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("src/paper2.txt"))));
    
            String str = "";
    
            while ((str = reader.readLine()) != null) {
                str = unicodeToChina(str);
                writer.write(str);
                writer.newLine();
            }
            writer.flush();
            writer.close();
        }

转载地址：

[https://blog.csdn.net/weixin\_38756990/article/details/72870207?utm\_medium=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare&depth\_1-utm\_source=distribute.pc\_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare][https_blog.csdn.net_weixin_38756990_article_details_72870207_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare]

[https_blog.csdn.net_weixin_38756990_article_details_72870207_utm_medium_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare_depth_1-utm_source_distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare]: https://blog.csdn.net/weixin_38756990/article/details/72870207?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.compare