使用java程序修改本地文件部分内容

/** * @author zhangjunyao * 修改本地文件内容 */public class AppModifyTest {/** * 读取文件内容 *  * @param filePath * @return */public String read(String filePath) {BufferedReader br = null;String line = null;StringBuffer buf = new StringBuffer();try {// 根据文件路径创建缓冲输入流br = new BufferedReader(new FileReader(filePath));// 循环读取文件的每一行, 对需要修改的行进行修改, 放入缓冲对象中while ((line = br.readLine()) != null) {// 此处根据实际需要修改某些行的内容if (line.startsWith("    upstream localhosttest {")) {buf.append(line).append("server 127.0.0.1:7001;");}else if (line.startsWith("b")) {buf.append(line).append(" start with b");}// 如果不用修改, 则按原来的内容回写else {buf.append(line);}buf.append(System.getProperty("line.separator"));}} catch (Exception e) {e.printStackTrace();} finally {// 关闭流if (br != null) {try {br.close();} catch (IOException e) {br = null;}}}return buf.toString();}/** * 将内容回写到文件中 *  * @param filePath * @param content */public void write(String filePath, String content) {BufferedWriter bw = null;try {// 根据文件路径创建缓冲输出流bw = new BufferedWriter(new FileWriter(filePath));// 将内容写入文件中bw.write(content);} catch (Exception e) {e.printStackTrace();} finally {// 关闭流if (bw != null) {try {bw.close();} catch (IOException e) {bw = null;}}}}/** * 主方法 */public static void main(String[] args) {String filePath = "D:/nginx-1.12.1/nginx-1.12.1/conf/nginx.conf"; // 文件路径FileModifyTest2 obj = new FileModifyTest2();for(int i=0;i<10;i++){obj.write(filePath, obj.read(filePath)); // 读取修改文件}}}