在算法设计与分析的课本上学到了编辑距离算法，回到宿舍后，用Java实现了，但当我要放到网上时，就出现了问题。
1.先是输入两个字符串的页面，editdistance.jsp.
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
</head>
<body>
<h3>确定两字符串的编辑距离</h3>
<form action="EditDistance" method="post">
<s:textfield name="s" label="输入字符串一" required="true"></s:textfield><br/>
<s:textfield name="t" label="输入字符串一" required="true"></s:textfield><br/>
<s:submit value="提交"></s:submit>
</form>
</body>
</html>
接下来是web.xml和struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter> <filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="linyu" extends="struts-default">
<action name="EditDistance" class="linyu.action.EditDistance">
<result>/success.jsp</result>
</action>
</package>
</struts>
接下来是EditDistance.java
package linyu.action;
import com.opensymphony.xwork2.ActionSupport; public class EditDistance extends ActionSupport{
public String s="a";
public String t="b";
public String getS() {
return s;
} public void setS(String s) {
this.s = s;
} public String getT() {
return t;
} public void setT(String t) {
this.t = t;
}
private static int Minimum(int a, int b, int c) {
int mi; mi = a;
if (b < mi) {
mi = b;
}
if (c < mi) {
mi = c;
}
return mi;
}
public String excute() throws Exception{
int d[][]; // matrix
int n; // length of s
int m; // length of t
int i; // iterates through s
int j; // iterates through t
char s_i; // ith character of s
char t_j; // jth character of t
int cost; // cost
String editdistance;
// Step 1 n = s.length();
m = t.length();
if (n == 0) {
editdistance=String.valueOf(m);
}
if (m == 0) {
editdistance=String.valueOf(n);
}
d = new int[n + 1][m + 1]; // Step
for (i = 0; i <= n; i++) {
d[i][0] = i;
} for (j = 0; j <= m; j++) {
d[0][j] = j;
} // Step 3 for (i = 1; i <= n; i++) {
s_i = s.charAt(i - 1);
// Step 4
for (j = 1; j <= m; j++) {
t_j = t.charAt(j - 1);
// Step 5
if (s_i == t_j) {
cost = 0;
} else {
cost = 1;
}
// Step 6
d[i][j] = Minimum(d[i - 1][j] + 1, d[i][j - 1] + 1,
d[i - 1][j - 1] + cost);
}
}
// Step 7
editdistance=String.valueOf(d[n][m]);
return SUCCESS; }
}
最后是返回成功页面，success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
</head>
<body> <br> 您输入的字符串是<s:property value="s"/>和<s:property value="t"/><br/>
他们的编辑距离是：<s:property value="editdistance"/>
</body>
</html>
完成后，进入editdistance.jsp页面，输入两个字串，点击提交后，就显示The requested resource (/suanfashejiyufenxi/EditDistance) is not available.我知道我的Action写错了，但错在哪里呢？要怎么改。积分不多，只能七十分喽。
1.先是输入两个字符串的页面，editdistance.jsp.
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
</head>
<body>
<h3>确定两字符串的编辑距离</h3>
<form action="EditDistance" method="post">
<s:textfield name="s" label="输入字符串一" required="true"></s:textfield><br/>
<s:textfield name="t" label="输入字符串一" required="true"></s:textfield><br/>
<s:submit value="提交"></s:submit>
</form>
</body>
</html>
接下来是web.xml和struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter> <filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app><?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="linyu" extends="struts-default">
<action name="EditDistance" class="linyu.action.EditDistance">
<result>/success.jsp</result>
</action>
</package>
</struts>
接下来是EditDistance.java
package linyu.action;
import com.opensymphony.xwork2.ActionSupport; public class EditDistance extends ActionSupport{
public String s="a";
public String t="b";
public String getS() {
return s;
} public void setS(String s) {
this.s = s;
} public String getT() {
return t;
} public void setT(String t) {
this.t = t;
}
private static int Minimum(int a, int b, int c) {
int mi; mi = a;
if (b < mi) {
mi = b;
}
if (c < mi) {
mi = c;
}
return mi;
}
public String excute() throws Exception{
int d[][]; // matrix
int n; // length of s
int m; // length of t
int i; // iterates through s
int j; // iterates through t
char s_i; // ith character of s
char t_j; // jth character of t
int cost; // cost
String editdistance;
// Step 1 n = s.length();
m = t.length();
if (n == 0) {
editdistance=String.valueOf(m);
}
if (m == 0) {
editdistance=String.valueOf(n);
}
d = new int[n + 1][m + 1]; // Step
for (i = 0; i <= n; i++) {
d[i][0] = i;
} for (j = 0; j <= m; j++) {
d[0][j] = j;
} // Step 3 for (i = 1; i <= n; i++) {
s_i = s.charAt(i - 1);
// Step 4
for (j = 1; j <= m; j++) {
t_j = t.charAt(j - 1);
// Step 5
if (s_i == t_j) {
cost = 0;
} else {
cost = 1;
}
// Step 6
d[i][j] = Minimum(d[i - 1][j] + 1, d[i][j - 1] + 1,
d[i - 1][j - 1] + cost);
}
}
// Step 7
editdistance=String.valueOf(d[n][m]);
return SUCCESS; }
}
最后是返回成功页面，success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%><html>
<head>
</head>
<body> <br> 您输入的字符串是<s:property value="s"/>和<s:property value="t"/><br/>
他们的编辑距离是：<s:property value="editdistance"/>
</body>
</html>
完成后，进入editdistance.jsp页面，输入两个字串，点击提交后，就显示The requested resource (/suanfashejiyufenxi/EditDistance) is not available.我知道我的Action写错了，但错在哪里呢？要怎么改。积分不多，只能七十分喽。
解决方案 »
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