应用Java泛型和反射导出CSV文件的方法

本文实例讲述了应用java泛型和反射导出csv文件的方法。分享给大家供大家参考。具体如下：

项目中有需求要把数据导出为csv文件，因为不同的类有不同的属性，为了代码简单，应用java的泛型和反射，写了一个函数，完成导出功能。

public <t> void savefile(list<t> list, string outfile) throws ioexception {
        if (list == null || list.isempty()) {
            return;
        }
        if (stringutils.isempty(outfile)) {
            throw new illegalargumentexception("outfile is null");
        }
        boolean isfirst = true;
        bufferedwriter out = null;
        try {
            out = new bufferedwriter(new filewriter(outfile));
            for (t t : list) {
                stringbuilder sb1 = new stringbuilder();
                stringbuilder sb2 = new stringbuilder();
                class clazz = (class) t.getclass();
                field[] fs = clazz.getdeclaredfields();
                for (int i = 0; i < fs.length; i++) {
                    field f = fs[i];
                    f.setaccessible(true);
                    try {
                        if (isfirst) {
                            sb1.append(f.getname());
                            sb1.append(",");
                        }
                        object val = f.get(t);
                        if (val == null) {
                            sb2.append("");
                        } else {
                            sb2.append(val.tostring());
                        }
                        sb2.append(",");
                    } catch (illegalargumentexception | illegalaccessexception e) {
                        e.printstacktrace();
                    }
                }
                if (isfirst) {
                    out.write(sb1.tostring());
                    isfirst = false;
                    out.newline();
                }
                out.write(sb2.tostring());
                out.newline();
            }
        } catch (ioexception e1) {
            throw e1;
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (ioexception e2) {
                throw e2;
            }
        }
}

希望本文所述对大家的java程序设计有所帮助。