技術標籤：【XML】javaxmlgzipxstream

近期和PC端對接介面，在線上環境經常出現PC端介面拉取資料時後臺負載高的情況，為了解決這個問題，我們將介面轉換成xml檔案格式，每當PC客戶端啟動時會拉取服務端最新的xml檔案，達到很好的使用者體驗。

1、整合Maven

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

xstream註解解釋：
@XStreamAlias(“id”)：將序列化中的類全量名稱，用別名替換。

2、工具類

生成xml檔案

 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()) {// 判斷目錄是否存在
 

            dir.mkdir();
        }
        String pathName = realPath + File.separator + fileName;
        //建立檔案
        File file = new File(pathName);
        if (file.exists()) {
            file.delete();
        }
        try {
            file.createNewFile();
        } catch (IOException e) {
            log.error("建立檔案發生錯誤");
        }
        //寫入資料
        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("生成檔案發生錯誤");
            } finally {
                outw.close();
                out.close();
            }
        } catch (Exception e1) {
            log.error("FileNotFoundException");
        }
        //壓縮檔案
        if (isCompress)
            doCompressFile(file, realPath);
    }

將xml檔案進行壓縮

  /**
     * 壓縮xml檔案成.gz
     *
     * @param source
     */
    public static void doCompressFile(File source, String realPath) {
        String realGzName = source.getName() + Constant.GZ_SUFFIX;
        String pathName = realPath + File.separator + realGzName;
        //建立檔案
        File target = new File(pathName);
        if (target.exists()) {
            target.delete();
        }
        try {
            target.createNewFile();
        } catch (IOException e) {
            log.error("建立檔案發生錯誤");
        }
        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發生異常");
            } finally {
                in.close();
                out.close();
            }
        } catch (FileNotFoundException e) {
            log.error("FileNotFoundException發生異常");
        } catch (IOException e) {
            log.error("IOException發生異常");
        }
    }

按照我提供的工具類，根據自己的實際需求基本上都可以使用

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