<html:link>?標簽用于生成HTML?<a>?元素。<html:link>?在創建超鏈接時，有兩個優點：??
(1)?允許在URL?中以多種方式包含請求參數。??
(2)?當用戶瀏覽器關閉Cookie?時，會自動重寫URL，把SessionID?作為請求參數包含在URL?中，用于跟蹤用戶的Session?狀態。??
<html:link>?標簽有以下重要屬性：??
(1)?forward：指定全局轉發鏈接。??
(2)?href：指定完整的URL?鍵接。??
(3)?page：指定相對于當前網頁的URL。??
????????<html:rewrite>?用于輸出超鏈接中的URI部分，但它并不生成HTML?<a>?元素。URI指的是URL?中協議、主機和端口以后的內容。URI?用于指定具體的請求資源。例如，對于URL：HTTP：//localhost:8080/HtmlBasic.do，它的URI為?/HtmlBasic.do ??
示例：??
1、創建全局轉發鏈接??
????首先，在Struts-config.xml?中<global-forwards>?元素中定義一個<forward>?元素：??
????<global-forwards>??
????????<forward?name?=?"index"?path="/index.jsp"/>??
????</global-forwards>??
????接著，在JSP?文件中創建<html:link>?標簽：??
????<html:link?forward="index">??
????????Link?to?Global?ActionForward??
????</html:link>??
????<html:link>?標簽的forward?屬性和<global-forwards>?元素中的<forward>?子元素匹配。以上代碼生成如下HTML?內容：??
????<a?href="/index.jsp"?mce_href="index.jsp">Link?to?Global?ActionFoward</a>??
????值得注意的是，<html:link>?的forward?屬性只引用Struts-config.xml?配置文件中<global-forwards>內的<forward>?子元素，如果引用<action>?內的<forward>?子元素，在運行時將會拋出異常：??
????Cannot?create?rewrite?URL:?Java.Net.MalfomedURlException:?Cannot?retrieve?ActionForward??
2、創建具有完整URL?的鏈接??
????如果Web?應用需要鏈接到其他站點，應該給出其他站點完整ＵＲＬ，例如：??
????<html:link?href="http://jakarta.apache.org/struts/index.html"?mce_href="http://jakarta.apache.org/struts/index.html">??
????????Generate?an?"href"?directly??
????</html:link>??
????生成HTML?代碼如下：??
????<a?href="http://jakarta.apache.org/struts/index.html"?mce_href="http://jakarta.apache.org/struts/index.html">Generate?an?"href"?directly</a>??
????值得注意的是，如果指定了<html:link>?標簽的href?屬性，即使用戶瀏覽器的Cookie?關閉，<html:link>?標簽也不會把用戶SessionID?作為請求參數加和到URL?中。??
3、從當前網頁中創建相對URL??
????如果從一個網頁鏈接到同一個應用中的另一網頁，可以采用以下方式：??
????<html:link?page="/HtmlBasic.do">??
????????A?relative?link?from?this?page??
????</html:link>??
????<html:link>?標簽的?page?屬性用于指定相對于當前應用的URI。以上代碼生成如下HTML?內容：??
????<a?href="/lib/HtmlBasic.do"?mce_href="lib/HtmlBasic.do">......</a>??
4、在URL?或?URI?中包含請求參數??
????如果要在URL或URI?中包含請求參數，只要把請求參數加在URL?或?URI的末尾就可以了。例如：??
????<html:link?page="/HtmlBasic.do?prop1=abc&prop2=123">??
????????Hard-code?the?url?parameters??
????</html:link>??
????<!--?or?-->??
????<html:rewrite?page="/HtmlBasic.do?prop1=abc&prop2=123"/>??
????以上代碼生成如下HTML?內容：??
????<a?href="/lib/HtmlBasic.do?prop1=abc&prop2=123"?mce_href="lib/HtmlBasic.do?prop1=abc&prop2=123"">......</a>??
????rewrite:?/HtmlBasic.do?prop1=abc&prop2=123??
????提示：在HTML?中&?代表特殊字符?"&"??
5、在URL?或?URI?中包含單個請求變量??
???????????????????
????????如果要在URL?中包含一個請求參數，而這人參數的值存在于當前網頁可訪問的一個變量中，可以按以下方法來實現。??
????????為了演示這一功能，首先創建一個當前網頁可訪問的變量。例如，本例中創建了兩個變量，一個是字符類型，一個是CustomerBean?，?它們存存于一個?page?范圍內：??
????<%??
????????/*?
?????????*?Create?a?string?object?to?store?as?a?bean?in?
?????????*?the?page?content?and?embed?in?this?link?
?????????*/??
????????String?stringBean?=?"Value?to?Pass?ont?URL";??
????????pageContext.setAttribute("stringBean",?stringBean);??
????%>??
????<jsp:useBean?id?=?"customerBean"?scope="page"?class="htmltaglibs.beans.CurstomerBean"/>??
????<jsp:setProperty?name="customerBean"?property="name"?value="weiqin"/>??
????????接著，把這兩個變量作為請求參數，加入到URL或URI?中：??
????<html:link?page="/HtmlBasic.do"??
??????????????????????paramId="urlParamName"??
??????????????????????paramName="stringBean">??
????????URL?encode?a?parameter?based?on?a?string?bean?value??
????</html:link>??
????<html:link?page="/HtmlBasic.do"??
???????????????????????paramId="urlParamName"??
???????????????????????paramName="customerBean"??
???????????????????????paramProperty="name">??
????????URL?encode?a?parameter?based?on?a?customer?bean?value??
????</html:link>??
????rewrite:?<html:rewrite?page="/HtmlBasic.do"??
???????????????????????????????????????????paramId="urlParamName"?paramName="stringBean"/>??
????rewrite:?<html:rewrite?page="/HtmlBasic.do"?????????????????????????????????????????????
???????????????????????????????????????????paramId="urlParamName"?paramName="customerBean"??
???????????????????????????????????????????paramProperty="name"/>??
????<html:link>?標簽的?paramId?屬性指定請求參數名，paramName?屬性指定變量的名字。如果變量為JavaBean?，用paramProperty?屬性指定JavaBean?的屬性。??
????對于本例的stringBean，請求參數值為stringBean?的字符串值。對于customerBean，指定了paramProperty?屬性，請求參數值為customerBean?的?name?屬性值。??
????以上代碼生成如下HTML?內容：??
????<a?href="/HtmlBasic.do?urlParamName=Value?to?Pass?on?Url"?mce_href="HtmlBasic.do?urlParamName=Value?to?Pass?on?Url">??
????????Url?encode?a?paramter?based?on?a?string?bean?value??
????</a>??
????<a?href="/HtmlBasic.do?urlParamName=weiqin"?mce_href="HtmlBasic.do?urlParamName=weiqin">??
????????url?encode?a?parameter?based?on?a?customer?bean?value??
????</a>??
????rewrite:?/HtmlBasic.do?urlParamName=Value?to?Pass?on?Url??
????rewrite:?/HtmlBasic.do?urlParamName=weiqin??
6、在URL?或?URI?中包含多個請求變量??
????如果在URL?或?URI?中包含多個請求參數，而這些參數的值來自多個變量，需要先定義一個Map類型的java?類，如java.util.HashMap，用它來存放請求變量。例如：??
????<%??
????????/*??
?????????*?Strore?values?int?a?Map(HashMap?in?this?case)??
?????????*?and?construct?the?URL?based?on?the?Map??
?????????*?/??
????????java.util.HashMap?myMap?=?new?java.util.HashMap();??
????????myMap.put("myString",?new?String("myStringValue"));??
????????myMap.put("myArray"?,?new?String[]{"str1","str2","str3"}?);??
????????pageContext.setAttribute("map",?myMap);??
????%>??
????在以上代碼的HaspMap?中存放了兩個對象，其中第二個對象是個字符串數組。HashMap?被存放在PageContext?中。?接下來就可以把這個HashMap?作為請求參數，加入到URL?或?URI?中：??
????<%--?For?this?version?of?the?<html:link>?tag:?--%>??
????<%--?map?=?a?map?with?name/value?pairs?to?pass?on?the?url?--%>??
????<html:link?page="/HtmlBasic.do"?name="map">??
????????URL?encode?a?parameter?based?on?value?in?a?Map??
????</html:link>??
????<%--?Create?the?same?rewrite?string?for?the?above?link.?--%>??
????rewrite:<html:rewrite?page="/HtmlBasic.do"?name="map"/>??
????<html:link>?標簽的name?屬性指定包含請求變量的HashMap?對象。HashMap?對象中的每一對"key/value"?代表一對或多對"請求參數名/請求參數值"。以上代碼生成如下的Html?內容：??
????<a?href="/HtmlBasic.do?myString=myStringValue&myArray=str1&myArray=str2&myArray=str3"?mce_href="HtmlBasic.do?myString=myStringValue&myArray=str1&myArray=str2&myArray=str3">??
????????URL?encode?a?parameter?based?on?value?in?a?Map??
????</a>??
?????
????rewrite:/HtmlBasic.do?myString=myStringValue&myArray=str1&myArray=str2&myArray=str3?

總結

以上是生活随笔為你收集整理的html链接代码分析的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。