/**
     * 
     * 创建搜索引擎   生成索引文件
     * @param path 索引文件路径
     */
    @SuppressWarnings("unchecked")
    public boolean writerinNet(String path) {
        boolean flag = false;
        //对诉求表进行查寻
        List<Appeal> list = this.getSqlMapClientTemplate().queryForList("appeal.writerinNet");
        try {
            //生成索引文件的对象 作用是把一个Document对象加载到索引中来
            IndexWriter iwriter = new IndexWriter(createFolder(path), analyzer,
                    true);
            //索引文件生成的最大值
            iwriter.setMaxFieldLength(25000);
            for(Appeal a:list){
                Document doc = new Document();
                doc.add(new Field("appealId", a.getAppealId()+""  , Field.Store.YES,
                        Field.Index.TOKENIZED));
                doc.add(new Field("appealTitle", a.getAppealTitle(),
                        Field.Store.YES, Field.Index.TOKENIZED,
                        Field.TermVector.WITH_POSITIONS_OFFSETS));
                doc.add(new Field("appealContent", a.getAppealContent(),
                        Field.Store.YES, Field.Index.TOKENIZED,
                        Field.TermVector.WITH_POSITIONS_OFFSETS));
                iwriter.addDocument(doc);
            }
            iwriter.close();
            flag = true;
        } catch (Exception e) {
            System.out.println(e);
        }
        return flag;
    }