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1
22 package kelp.webapp.presentation;
23
24 import org.w3c.dom.html.HTMLInputElement;
26
27 import javax.servlet.ServletException  ;
29 import javax.servlet.ServletOutputStream ;
30 import javax.servlet.http.HttpServlet ;
31 import javax.servlet.http.HttpServletRequest ;
32 import javax.servlet.http.HttpServletResponse ;
33 import javax.servlet.http.HttpSession ;
34
35 import java.io.IOException ;
37 import java.io.File ;
38 import java.io.FileInputStream ;
39 import java.io.FileOutputStream ;
40 import java.util.Properties ;
41
42
48 public class FormServlet extends HttpServlet {
49 public void doPost(HttpServletRequest request,
50 HttpServletResponse response) throws ServletException ,
51 IOException {
52 doGet(request, response);
53 }
54
55 public void doGet(HttpServletRequest request,
56 HttpServletResponse response) throws ServletException ,
57 IOException {
58 FormHTML page = null;
59 ServletOutputStream out;
60 Properties data = null;
61 byte[] buffer;
62
63 data = initData(request, data);
64 data = saveParameters(request, data);
65 page = createPage(data);
66 buffer = page.toDocument().getBytes();
67 response.setContentType("text/html");
68 response.setContentLength(buffer.length);
69 out = response.getOutputStream();
70 out.write(buffer);
71 out.flush();
72 response.flushBuffer();
73 }
74
75 private Properties saveParameters(HttpServletRequest request,
76 Properties data) {
77 String paramFirst = null;
78 String paramLast = null;
79
80 try {
81 paramFirst = request.getParameter("first");
82 paramLast = request.getParameter("last");
83 } catch (Exception e) {
84 paramFirst = null;
85 paramLast = null;
86 }
87 if (paramFirst != null && paramLast != null) {
88 data.put("first", paramFirst);
89 data.put("last", paramLast);
90 writePropertyFile(data);
91 }
92 return data;
93 }
94
95 public FormHTML createPage(Properties data) {
96 String first = null;
97 String last = null;
98 HTMLInputElement inputFirst = null;
99 HTMLInputElement inputLast = null;
100 FormHTML page = null;
101
102 page = new FormHTML();
103 first = (String ) data.get("first");
104 last = (String ) data.get("last");
105 inputFirst = page.getElementFirst();
106 inputLast = page.getElementLast();
107 inputFirst.setValue(first);
108 inputLast.setValue(last);
109 return page;
110 }
111
112 private void writePropertyFile(Properties data) {
113 FileOutputStream out = null;
114 String dataPath = null;
115
116 dataPath = getDataPath();
117 try {
118 out = new FileOutputStream (dataPath, false);
119 data.store(out, "Data for Form page");
120 out.close();
121 } catch (java.io.IOException e) {
122 e.printStackTrace();
123 }
124 }
125
126 private Properties readPropertyFile(Properties data) {
127 FileInputStream is = null;
128 String dataPath = null;
129
130 dataPath = getDataPath();
131 try {
132 is = new FileInputStream (dataPath);
133 data = new Properties ();
134 data.load(is);
135 is.close();
136 } catch (Exception e) {
137
138 e.printStackTrace();
140 data = new Properties ();
141 data.put("first", "Luke");
142 data.put("last", "Skywalker");
143 }
144 return data;
145 }
146
147 private Properties initData(HttpServletRequest request, Properties data) {
148 HttpSession session = null;
149
150 session = request.getSession(true);
151
152 if (session != null) {
153 data = (Properties ) session.getAttribute("data");
154 }
155 if (data == null) {
156 data = readPropertyFile(data);
157 }
158 return data;
159 }
160
161 private String getDataPath() {
162 StringBuffer pathBuf = new StringBuffer ();
163 String testPath = getInitParameter("testDataPath");
164
165 if (testPath == null) {
166 System.out.println("init-parm not found: testDataPath");
167 } else {
168 pathBuf.append(testPath);
169
170 int lastAt = -1;
172
173 lastAt = pathBuf.length() - 1;
174 if (pathBuf.charAt(lastAt) == '"') {
175 pathBuf.deleteCharAt(lastAt);
176 }
177 if (pathBuf.charAt(0) == '"') {
178 pathBuf.deleteCharAt(0);
179 }
180 pathBuf.append('/');
181 pathBuf.append("form.properties");
182 }
183 return pathBuf.toString();
184 }
185
186 }
187 |
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