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对Response的一些常用操作

RIOChing 2022-01-12 阅读 143
javatomcat
public class ResponseUtils {

	public static void responseJson(HttpServletResponse response, String text) {
		render(response, "application/json;charset=UTF-8", text);
	}

	public static void responseScript(HttpServletResponse response, String script) {
		render(response, "application/javascript", script);
	}

	public static void responseTextHtml(HttpServletResponse response, String text) {
		render(response, "text/html;charset=UTF-8", text);
	}

	public static void responseXml(HttpServletResponse response, String text) {
		render(response, "text/xml;charset=UTF-8", text);
	}

	public static void responseText(HttpServletResponse response, String text) {
		render(response, "text/plain;charset=UTF-8", text);
	}

	public static void responseFile(HttpServletResponse response, InputStream is, String fileName) {
		writeInputStream(response, is, fileName);
	}

	public static void responseFile(HttpServletResponse response, String filePath, String fileName, boolean isTemp) {
		// 获取服务器文件
		File file = new File(filePath);
		if (!file.exists()) {
			return;
		}
		try {
			writeInputStream(response, new FileInputStream(file), fileName);
			if (file.exists() && isTemp) {
				file.delete();
			}
		} catch (Exception e) {
		}
	}

	private static void render(HttpServletResponse response, String contentType, String text) {
		response.setContentType(contentType);
		try {
			response.getWriter().write(text);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private static void writeInputStream(HttpServletResponse response, InputStream is, String fileName) {
		if (null == is) {
			return;
		}
		/* 设置文件ContentType类型,这样设置,会自动判断下载文件类型 */
		response.setContentType("multipart/form-data");
		/* 设置文件头:最后一个参数是设置下载文件名 */
		response.setCharacterEncoding("utf-8");
		// ".zip"
		try (OutputStream os = response.getOutputStream()) {
			response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
			byte[] b = new byte[1024];
			int len;
			while ((len = is.read(b)) > 0) {
				os.write(b, 0, len);
				os.flush();
			}
		} catch (Exception e) {
		} finally {
			try {
				is.close();
			} catch (IOException e) {
			}
		}
	}
}
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