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app2.b.java |
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1 package sutut1;
2
3 import javax.servlet.*;
4 import javax.servlet.http.*;
5 import java.io.*;
6 import java.util.*;
7
8 import us.oh.state.common.utility.*;
9
10 public class app2 extends HttpServlet {
11
12 // actions
13 private static final String LOGIN = "Proceed";
14 private static final String MORE_DATA = "Enter More";
15 private static final String CHART = "Chart";
16 private static final String LOGOUT = "Cancel";
17
18 // keys
19 private static final String ACTION = "action";
20 private static final String USERNAME = "username";
21 private static final String START_YEAR = "starting_year";
22 private static final String MORE_YEAR = "more_year";
23 private static final String SALARY_COUNT = "salary_count";
24
25 private Properties configOptions = null;
26
27 public void init(ServletConfig cfg) throws ServletException {
28 String confFileName = cfg.getInitParameter("configFile");
29 if ((confFileName == null) || (confFileName.length() == 0))
30 throw new ServletException("No configuration information found!");
31 configOptions = new Properties();
32 try {
33 FileInputStream propFile = new FileInputStream(confFileName);
34 configOptions.load(propFile);
35 propFile.close();
36 }
37 catch (IOException e) {
38 throw new ServletException("Can't read configuration from " + confFileName);
39 }
40 String dataFileName = configOptions.getProperty("cpidata");
41 if ((dataFileName == null) || (dataFileName.length() == 0))
42 throw new ServletException("No cpidata file name specified");
43 try {
44 CPIData = parseCPIData(dataFileName);
45 }
46 catch (IOException e) {
47 throw new ServletException("Can't read data from " + dataFileName);
48 }
49 }
50
51 private class CPI {
52 int year;
53 double indexPercentage;
54 CPI(int year, double indexPercentage) {
55 this.year = year;
56 this.indexPercentage = indexPercentage;
57 }
58 }
59
60 private static CPI [] CPIData = null;
61
62 private CPI [] parseCPIData(String fileName) throws IOException {
63 LineNumberReader reader = new LineNumberReader(new FileReader(fileName));
64 Vector tmpCache = new Vector();
65 int year = 0;
66 double index = 0.0;
67 while (true) {
68 String line = reader.readLine();
69 if (line == null) break;
70 StringTokenizer column = new StringTokenizer(line, ",");
71 if ((column == null) || !column.hasMoreTokens()) continue;
72 String s = column.nextToken();
73 try {
74 year = Integer.parseInt(s);
75 }
76 catch (NumberFormatException e) {
77 continue; // not a data line, perhaps the header
78 }
79 while (column.hasMoreTokens()) {
80 s = column.nextToken();
81 }
82 // the last column is the annual index
83 try {
84 index = Double.parseDouble(s);
85 }
86 catch (NumberFormatException e) {
87 System.err.println("Bad data found at line " + reader.getLineNumber());
88 }
89 tmpCache.addElement(new CPI(year, index));
90 }
91 reader.close();
92 Enumeration enum = tmpCache.elements();
93 CPI [] data = new CPI[tmpCache.size()];
94 int i = 0;
95 while (enum.hasMoreElements()) data[i++] = (CPI)enum.nextElement();
96 return data;
97 }
98
99 public void doGet(HttpServletRequest request, HttpServletResponse response)
100 throws ServletException, IOException {
101 HttpSession ses = request.getSession(true);
102 if (ses == null) {
103 HtmlPage page = new HtmlPage(response);
104 String s = "Sorry...";
105 page.title(s);
106 page.body();
107 page.center(true);
108 page.heading(1, s);
109 page.heading(2, "There are too many users to let you sign in");
110 page.out.println("Come back later");
111 page.close();
112 return;
113 }
114 String username = (String)ses.getValue(USERNAME);
115 if (ses.isNew() || (username == null)) signIn(request, response);
116 else acceptValues(request, response, ses);
117 }
118
119 public void doPost(HttpServletRequest request, HttpServletResponse response)
120 throws ServletException, IOException {
121 String action = request.getParameter(ACTION);
122 HttpSession ses = request.getSession(true);
123 String username = (String)ses.getValue(USERNAME);
124 if (LOGIN.equals(action)) {
125 ses.putValue(USERNAME, request.getParameter(USERNAME));
126 try {
127 Integer year = new Integer(request.getParameter(START_YEAR));
128 ses.putValue(START_YEAR, year);
129 ses.putValue(MORE_YEAR, year);
130 }
131 catch (NumberFormatException e) {
132 ses.putValue(START_YEAR, new Integer(1985));
133 ses.putValue(MORE_YEAR, new Integer(1985));
134 }
135 acceptValues(request, response, ses);
136 return;
137 }
138 if (ses.isNew() || (username == null)) signIn(request, response);
139 else if (MORE_DATA.equals(action)) {
140 appendData(request, response, ses);
141 acceptValues(request, response, ses);
142 }
143 else if (CHART.equals(action)) {
144 makeChart(request, response, ses);
145 }
146 else {
147 ses.invalidate();
148 signIn(request, response);
149 }
150 }
151
152 // Send the user here if there isn't any session data or it has become invalid
153 private void signIn(HttpServletRequest request, HttpServletResponse response)
154 throws ServletException, IOException {
155 HtmlPage page = new HtmlPage(response);
156 String s = "Compare salary to cost of living";
157 page.title(s);
158 page.body();
159 page.center(true);
160 page.heading(1, s);
161 page.heading(2, "Please sign in");
162 page.form(request.getServletPath());
163 page.table(0);
164 page.tField("Name:", USERNAME, "to print on report", 20, 40);
165 page.tField("Starting year:", START_YEAR, "1985", 20, 40);
166 page.row();
167 page.col();
168 page.col();
169 page.submit(ACTION, LOGIN);
170 page.table();
171 page.form();
172 page.close();
173 }
174
175 private void acceptValues(HttpServletRequest request, HttpServletResponse response,
176 HttpSession ses) throws ServletException, IOException {
177 HtmlPage page = new HtmlPage(response);
178 String s = "Data entry - " + (String)ses.getValue(USERNAME);
179 page.title(s);
180 page.body();
181 page.center(true);
182 page.heading(1, s);
183 int count = 0;
184 int start = 0;
185 try {
186 start = ((Integer)ses.getValue(START_YEAR)).intValue();
187 count = ((Integer)ses.getValue(SALARY_COUNT)).intValue();
188 }
189 catch (Exception e) {
190 }
191 page.heading(3, count + " values entered so far, starting with " + start);
192 String servlet = request.getServletPath();
193 page.form(servlet);
194 page.table(0);
195 page.row();
196 page.col();
197 page.out.println("Year");
198 page.col();
199 page.out.println("Salary (USD)");
200 Integer moreYear = (Integer)ses.getValue(MORE_YEAR);
201 int year = 1985;
202 if (moreYear != null) year = moreYear.intValue();
203 int n = year + 5;
204 while (year < n) {
205 page.row();
206 page.col();
207 page.out.println(year);
208 page.col();
209 page.field("sal" + year, "0", 10, 10);
210 ++year;
211 }
212 ses.putValue(MORE_YEAR, new Integer(year));
213 page.table();
214 page.submit(ACTION, MORE_DATA);
215 page.form();
216 page.form(servlet, CHART, "target=_blank");
217 page.submit(ACTION, CHART);
218 page.form();
219 page.form(servlet, LOGOUT);
220 page.submit(ACTION, LOGOUT);
221 page.form();
222 page.close();
223 }
224
225 private void appendData(HttpServletRequest request, HttpServletResponse response,
226 HttpSession ses) throws ServletException, IOException {
227 Enumeration parameterList = request.getParameterNames();
228 int count = 0;
229 try {
230 count = ((Integer)ses.getValue(SALARY_COUNT)).intValue();
231 }
232 catch (Exception e) {
233 }
234 while (parameterList.hasMoreElements()) {
235 String parm = (String)parameterList.nextElement();
236 Integer val = null;
237 try {
238 val = new Integer(request.getParameter(parm));
239 }
240 catch (NumberFormatException e) {
241 val = new Integer(0);
242 }
243 if (parm.startsWith("sal")) {
244 ++count;
245 ses.putValue(parm, val);
246 }
247 }
248 ses.putValue(SALARY_COUNT, new Integer(count));
249 }
250
251 private void makeChart(HttpServletRequest request, HttpServletResponse response,
252 HttpSession ses) throws ServletException, IOException {
253 response.setContentType("application/pdf");
254 PdfChart chart = new PdfChart(response.getOutputStream(),
255 (int)(11.0 * PdfChart.POINTS_PER_INCH), (int)(8.5 * PdfChart.POINTS_PER_INCH));
256 chart.setTextColor(0x0);
257 chart.setFont(chart.BOLD, 18);
258 chart.println((String)ses.getValue(USERNAME));
259 chart.setFont(chart.NORMAL, 12);
260 chart.println(new Date().toString());
261 chart.drawMain(1.0, 2.0, 9.0, 5.0, 5, 4, 0xdddddd, 1.5, 0x0);
262 chart.close();
263 }
264
265 }
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app2.b.java |
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