/
ServletUtils.java
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/
ServletUtils.java
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package cn.iocoder.yudao.framework.common.util.servlet;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.extra.servlet.ServletUtil;
import cn.iocoder.yudao.framework.common.util.json.JsonUtils;
import org.springframework.http.MediaType;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.Map;
/**
* 客户端工具类
*
* @author 芋道源码
*/
public class ServletUtils {
/**
* 返回 JSON 字符串
*
* @param response 响应
* @param object 对象,会序列化成 JSON 字符串
*/
@SuppressWarnings("deprecation") // 必须使用 APPLICATION_JSON_UTF8_VALUE,否则会乱码
public static void writeJSON(HttpServletResponse response, Object object) {
String content = JsonUtils.toJsonString(object);
ServletUtil.write(response, content, MediaType.APPLICATION_JSON_UTF8_VALUE);
}
/**
* 返回附件
*
* @param response 响应
* @param filename 文件名
* @param content 附件内容
*/
public static void writeAttachment(HttpServletResponse response, String filename, byte[] content) throws IOException {
// 设置 header 和 contentType
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
// 输出附件
IoUtil.write(response.getOutputStream(), false, content);
}
/**
* @param request 请求
* @return ua
*/
public static String getUserAgent(HttpServletRequest request) {
String ua = request.getHeader("User-Agent");
return ua != null ? ua : "";
}
/**
* 获得请求
*
* @return HttpServletRequest
*/
public static HttpServletRequest getRequest() {
RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
if (!(requestAttributes instanceof ServletRequestAttributes)) {
return null;
}
return ((ServletRequestAttributes) requestAttributes).getRequest();
}
public static String getUserAgent() {
HttpServletRequest request = getRequest();
if (request == null) {
return null;
}
return getUserAgent(request);
}
public static String getClientIP() {
HttpServletRequest request = getRequest();
if (request == null) {
return null;
}
return ServletUtil.getClientIP(request);
}
public static boolean isJsonRequest(ServletRequest request) {
return StrUtil.startWithIgnoreCase(request.getContentType(), MediaType.APPLICATION_JSON_VALUE);
}
public static String getBody(HttpServletRequest request) {
// 只有在 json 请求在读取,因为只有 CacheRequestBodyFilter 才会进行缓存,支持重复读取
if (isJsonRequest(request)) {
return ServletUtil.getBody(request);
}
return null;
}
public static byte[] getBodyBytes(HttpServletRequest request) {
// 只有在 json 请求在读取,因为只有 CacheRequestBodyFilter 才会进行缓存,支持重复读取
if (isJsonRequest(request)) {
return ServletUtil.getBodyBytes(request);
}
return null;
}
public static String getClientIP(HttpServletRequest request) {
return ServletUtil.getClientIP(request);
}
public static Map<String, String> getParamMap(HttpServletRequest request) {
return ServletUtil.getParamMap(request);
}
}