Struts2Utils方法详解
发布时间：2017-11-02 10:38:27
package com.apdplat.platform.util; import com.apdplat.platform.log.APDPlatLogger;import java.io.IOException;import java.io.OutputStream;im ...
package com.apdplat.platform.util; import com.apdplat.platform.log.APDPlatLogger;import java.io.IOException;import java.io.OutputStream;import java.util.Collection;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import net.sf.json.JSONArray;import net.sf.json.JSONObject;import org.apache.commons.lang.StringUtils;import org.apache.struts2.ServletActionContext;/***Struts2工具类* @author 杨尚川*/public class Struts2Utils { protected static final APDPlatLogger log = new APDPlatLogger(Struts2Utils.class); private Struts2Utils(){ }; private static final String ENCODING_PREFIX = "encoding";private static final String NOCACHE_PREFIX = "no-cache";private static final String ENCODING_DEFAULT = "UTF-8";private static final boolean NOCACHE_DEFAULT = true; private static final String TEXT_TYPE = "text/plain";private static final String JSON_TYPE = "application/json";private static final String "text/;private static final String HTML_TYPE = "text/html";private static final String JS_TYPE = "text/javascript"; public static HttpSession getSession() { return ServletActionContext.getRequest().getSession(); } public static HttpServletRequest getRequest() { return ServletActionContext.getRequest(); } public static HttpServletResponse getResponse() { return ServletActionContext.getResponse(); } public static String getParameter(String name) { return getRequest().getParameter(name); } public static void render(final String contentType, final String content, final String... headers) { try { //分析headers参数String encoding = ENCODING_DEFAULT;boolean noCache = NOCACHE_DEFAULT;for (String header : headers) { String headerName = StringUtils.substringBefore(header, ":");String headerValue = StringUtils.substringAfter(header, ":"); if (StringUtils.equalsIgnoreCase(headerName, ENCODING_PREFIX)) { encoding = headerValue; } else if (StringUtils.equalsIgnoreCase(headerName, NOCACHE_PREFIX)) { noCache = Boolean.parseBoolean(headerValue); } else { throw new IllegalArgumentException(headerName + "不是一个合法的header类型"); } } HttpServletResponse response = ServletActionContext.getResponse(); //设置headers参数String fullContentType = contentType + ";charset=" + encoding;response.setContentType(fullContentType);if (noCache) { response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0); } response.getWriter().write(content);response.getWriter().flush(); } catch (IOException e) { log.error(e.getMessage(), e); } } /** * 直接输出文本. * @see #render(String, String, String...) */public static void renderText(final String text, final String... headers) { render(TEXT_TYPE, text, headers); } /** * 直接输出HTML. * @see #render(String, String, String...) */public static void renderHtml(final String html, final String... headers) { render(HTML_TYPE, html, headers); } /** * 直接输出 * @see #render(String, String, String...) */public static void renderfinal String final String... headers) { render( } /** * 直接输出JSON. * * @param jsonString json字符串. * @see #render(String, String, String...) */public static void renderJson(final String jsonString, final String... headers) { render(JSON_TYPE, jsonString, headers); } /** * 直接输出JSON. * * @param map Map对象,将被转化为json字符串. * @see #render(String, String, String...) */@SuppressWarnings("unchecked")public static void renderJson(final Map map, final String... headers) { String jsonString = JSONObject.fromObject(map).toString();render(JSON_TYPE, jsonString, headers); } /** * 直接输出JSON. * * @param object Java对象,将被转化为json字符串. * @see #render(String, String, String...) */public static void renderJson(final Object object, final String... headers) { String jsonString = JSONObject.fromObject(object).toString();render(JSON_TYPE, jsonString, headers); } /** * 直接输出JSON. * * @param collection Java对象集合, 将被转化为json字符串. * @see #render(String, String, String...) */public static void renderJson(final Collection<?> collection, final String... headers) { String jsonString = JSONArray.fromObject(collection).toString();render(JSON_TYPE, jsonString, headers); } /** * 直接输出JSON. * * @param array Java对象数组, 将被转化为json字符串. * @see #render(String, String, String...) */public static void renderJson(final Object[] array, final String... headers) { String jsonString = JSONArray.fromObject(array).toString();render(JSON_TYPE, jsonString, headers); } public static void renderImage(byte[] data,String type){ try { HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType(type); try (OutputStream out = response.getOutputStream()) { out.write(data, 0, data.length); out.flush(); } } catch (IOException e) { log.error("渲染图像失败",e); } } /** * 直接输出支持跨域Mashup的JSONP. * * @param callbackName callback函数名. * @param contentMap Map对象,将被转化为json字符串. * @see #render(String, String, String...) */@SuppressWarnings("unchecked")public static void renderJsonp(final String callbackName, final Map contentMap, final String... headers) { String jsonParam = JSONObject.fromObject(contentMap).toString(); StringBuilder result = new StringBuilder().append(callbackName).append("(").append(jsonParam).append(");"); //渲染Content-Type为javascript的返回内容,输出结果为javascript语句, 如callback197("{content:'Hello World!!!'}");render(JS_TYPE, result.toString(), headers); } }
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原标题：Struts2Utils方法详解
关键词：Struts
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