Java将数据生成XML文件并进行压缩成GZ格式

近期和PC端对接接口，在线上环境经常出现PC端接口拉取数据时后台负载高的情况，为了解决这个问题，我们将接口转换成xml文件格式，每当PC客户端启动时会拉取服务端最新的xml文件，达到很好的用户体验。

1、集成Maven

     <dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.12</version>
        </dependency>

xstream注解解释：
@XStreamAlias(“id”)：将序列化中的类全量名称，用别名替换。

2、工具类

生成xml文件

 public static <T> void listObjectToXmlFile(List<T> list, String path, String fileName, Integer tradeDate, boolean isCompress) {
    
    
        XStream xStream = new XStream(new DomDriver("UTF-8"));
        xStream.autodetectAnnotations(true);
        xStream.registerConverter(new DateConverter("yyyy-MM-dd HH:mm:ss", null, TimeZone.getTimeZone("GMT+8")));
        String xml = xStream.toXML(list);
        String realPath = path + tradeDate;
        File dir = new File(realPath);
        if (!dir.exists()) {
    
    // 判断目录是否存在
            dir.mkdir();
        }
        String pathName = realPath + File.separator + fileName;
        //创建文件
        File file = new File(pathName);
        if (file.exists()) {
    
    
            file.delete();
        }
        try {
    
    
            file.createNewFile();
        } catch (IOException e) {
    
    
            log.error("创建文件发生错误");
        }
        //写入数据
        FileOutputStream out = null;
        OutputStreamWriter outw = null;
        try {
    
    
            out = new FileOutputStream(file);
            outw = new OutputStreamWriter(out, "UTF-8");
            try {
    
    
                outw.write(xml);
            } catch (IOException e) {
    
    
                log.error("生成文件发生错误");
            } finally {
    
    
                outw.close();
                out.close();
            }
        } catch (Exception e1) {
    
    
            log.error("FileNotFoundException");
        }
        //压缩文件
        if (isCompress)
            doCompressFile(file, realPath);
    }

将xml文件进行压缩

  /**
     * 压缩xml文件成.gz
     *
     * @param source
     */
    public static void doCompressFile(File source, String realPath) {
    
    
        String realGzName = source.getName() + Constant.GZ_SUFFIX;
        String pathName = realPath + File.separator + realGzName;
        //创建文件
        File target = new File(pathName);
        if (target.exists()) {
    
    
            target.delete();
        }
        try {
    
    
            target.createNewFile();
        } catch (IOException e) {
    
    
            log.error("创建文件发生错误");
        }
        FileInputStream in = null;
        GZIPOutputStream out = null;
        try {
    
    
            in = new FileInputStream(source);
            out = new GZIPOutputStream(new FileOutputStream(target));
            byte[] buf = new byte[10240];
            int len = 0;
            try {
    
    
                while (((in.available() > 10240) && (in.read(buf)) > 0)) {
    
    
                    out.write(buf);
                }
                len = in.available();
                in.read(buf, 0, len);
                out.write(buf, 0, len);
                out.flush();
            } catch (IOException e) {
    
    
                log.error("IOException发生异常");
            } finally {
    
    
                in.close();
                out.close();
            }
        } catch (FileNotFoundException e) {
    
    
            log.error("FileNotFoundException发生异常");
        } catch (IOException e) {
    
    
            log.error("IOException发生异常");
        }
    }

按照我提供的工具类，根据自己的实际需求基本上都可以使用

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